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扇形面积 S = (1/2)αR^2, 当 α 减少 30', dα = ° = -π/360, dS = (1/2)R^2dα = -(1/2)100^2 · π/360 = 平方厘米扇形面积减少约 平方厘米；当 R 增加 1 厘米, dR = 1 dS = αRdR = 100 · 1 · 60π/180 = 平方厘米扇形面积增加约 平方厘米。

A virtual world is an interactive simulated environment accessed by multiple users through an online interface. Virtual worlds are also called "digital worlds," "simulated worlds" and "MMOG's." There are many different types of virtual worlds, however there are six features all of them have in common: 1. Shared Space: the world allows many users to participate at once. 2. Graphical User Interface: the world depicts space visually, ranging in style from 2D "cartoon" imagery to more immersive 3D environments. 3. Immediacy: interaction takes place in real time. 4. Interactivity: the world allows users to alter, develop, build, or submit customized content. 5. Persistence: the world's existence continues regardless of whether individual users are logged in. 6. Socialization/Community: the world allows and encourages the formation of in-world social groups like teams, guilds, clubs, cliques, housemates, neighborhoods, etc. --------------------------------------------------------------------------------Virtual worlds have been created for many different purposes. The largest and most common type of virtual world is the "MMORPG" which stands for "Massively Multiplayer Online Role Playing Game." But virtual worlds have also been built for purposes other than gaming. The following section summarizes a few ways in which virtual worlds are currently used: Commercial GamingCommercial gaming worlds tend to focus on a singular fictional theme and consistently follow formal conventions such as character-focused avatars, progression through an interactive narrative storyline, and a series of competitive events. Strongly influenced by fantasy, science fiction, and anime genres of literature and film, the majority of sizable virtual worlds in existence today are commercial gaming worlds. Examples include Everquest, Lineage 2, and World of Warcraft. While Virtual Worlds Review includes several top-quality gaming worlds on the review list, we mostly feature worlds that fall outside the traditional gaming mold. Fortunately there are many other great sites that contain comprehensive lists of commercial gaming worlds. Here are a few: Gamespot Gamespy Socializing / Online Community BuildingIn addition to the traditional fantasy RPG worlds, there are many commercial community-focused virtual worlds that emphasize socializing rather than gaming. These worlds offer a more open-ended experience and are strongly influenced by the cultures of text-based chat rooms. Although small-scale, casual games may be incorporated into a social world, participants are not necessarily there to win or play a game, but rather to socialize with others and, in many cases, create and decorate a personal space such as a home, room, or apartment. Social worlds tend to use settings based on idealized versions of reality. Most provide some basic building tools and the ability to host activities and events that revolve around a wide variety of topics. EducationSome virtual worlds have been created for educational purposes. In most cases, educational worlds are sponsored by academic institutions or nonprofit organizations, although some educational worlds are sponsored by corporations. Educational worlds come in a wide variety of forms, including 3D recreations of museum and gallery spaces, computer programming tutorials, virtual libraries, and meeting spaces for online university courses. Active Worlds Educational Universe is one of the oldest and largest networks of educational worlds. Adobe Atmosphere is also being used to build virtual worlds for educational purposes. A great example of a corporate-sponsored educational world is Mokitown. Political ExpressionVirtual worlds can serve as forums for political expression and debate. While real-world political issues can crop up in gaming, social, and educational worlds, there are a few cases in which completely separate virtual worlds have been built for the purpose of political debate or even experiments in various types of self-governing online communities. A great example of a virtual world with a political focus is AgoraXchange. Military TrainingVirtual world technologies are also being used in some interesting ways by the . military. America's Army is being used as a tool to recruit potential soldiers, while companies like Forterra Systems are working with military groups to develop training simulations. And this is just the beginning. As these technologies develop further over the next several years, virtual worlds will be used for all types of purposes as more people begin spending more time in them. If you're new to the "world of virtual worlds" we hope that Virtual Worlds Review will serve as a user-friendly, informative place to learn a bit about them. For those who are already familiar with virtual worlds, we hope the site will let you know about other types of worlds you may not have heard of before. In either case, welcome and enjoy the site. -------------------A virtual world is a computer-based simulated environment intended for its users to inhabit and interact via avatars. These avatars are usually depicted as textual, two-dimensional, or three-dimensional graphical representations, although other forms are possible[1] (auditory[2] and touch sensations for example). Some, but not all, virtual worlds allow for multiple computer accesses a computer-simulated world and presents perceptual stimuli to the user, who in turn can manipulate elements of the modeled world and thus experiences telepresence to a certain degree.[3] Such modeled worlds may appear similar to the real world or instead depict fantasy worlds. The model world may simulate rules based on the real world or some hybrid fantasy world. Example rules are gravity, topography, locomotion, real-time actions, and communication. Communication between users has ranged from text, graphical icons, visual gesture, sound, and rarely, forms using touch and balance multiplayer online games commonly depict a world similar to the real world, with real world rules and real-time actions, and communication. Communication is usually textual, with real-time voice communication using VOIP also possible.[clarify]Virtual worlds are not limited to games but, depending on the degree of immediacy presented, can encompass computer conferencing and text based concept of virtual worlds predates computers and could be traced in some sense to Pliny.[5] The mechanical-based 1962 Sensorama machine used the senses of vision, sound, balance, smells and touch (via wind) to simulate its world. Among the earliest virtual worlds to be implemented by computers were not games but generic virtual reality simulators, such as Ivan Sutherland's 1968 virtual reality device. This form of virtual reality is characterized by bulky headsets and other types of sensory input simulation. Contemporary virtual worlds, multi-user online virtual environments, emerged mostly independently of this virtual reality technology research, fueled instead by the gaming industry but drawing on similar inspiration.[6] While classic sensory-imitating virtual reality relies on tricking the perceptual system into experiencing an imersive environment, virtual worlds typically rely on mentally and emotionally engaging content which gives rise to an immersive first virtual worlds presented on the Internet were communities and chat rooms, some of which evolved into MUDs and MUSHes. MUDs, short for “Multi User Dungeons,” are examples of virtual worlds that consist of virtual space inhabited by representations of data and other users [7]. Early virtual worlds were text-based, offering limited graphical representation, and often using a Command Line War (also known as The Maze Game, Maze Wars or simply Maze) was the first networked, 3D multi-user first person shooter game. Maze first brought us the concept of online players as eyeball "avatars" chasing each other around in a maze.” (, 29th Feb). According to the website this was in 1974, it was played on Arpanet (the initial internet), however it could only be played on an Imlac, as it was specifically built for this type of in 1978 MUD was released, it however was not 3D, it was text-based and used a TELNET program, by following the link you will be able to play the game, and understand just how far virtual worlds have come since . You can understandably argue whether or not this is a “virtual world” and that Maze War was more sophisticated (being 3D), but you must understand that MUD could be played by anyone, Maze War was computer specific. Perhaps in today’s senses it is not a true virtual world, but the idea of a virtual world in those days were different (see Neuromancer link in bibliography for more information).Some early prototyptes were WorldsAway, a prototype interactive communities featuring a virtual world by CompuServe called Dreamscape, Cityspace, an educational networking and 3D computer graphics project for children, and The Palace, a 2-dimensional community driven virtual world. However, credit for the first online virtual world usually goes to Habitat, developed in 1987 by LucasFilm Games for the Commodore 64 computer, and running on the Quantum Link service (the precursor to America Online).[citation needed]In 1996, the city of Helsinki, Finland with Helsinki Telephone Company (since Elisa Group) launched what was called the first online virtual 3D depiction intended to map an entire city. The Virtual Helsinki project was eventually renamed Helsinki Arena 2000 project and parts of the city in modern and historical context were rendered in 3D.[citation needed][edit] Virtual world conceptsOne perception of virtual worlds requires an online persistent world, active and available 24 hours a day and seven days a week, to qualify as a true virtual world.[citation needed] Although this is possible with smaller virtual worlds, especially those that are not actually online, no massively multiplayer game runs all day, every day. All the online games listed above[clarify] include downtime for maintenance that is not included as time passing in the virtual world. While the interaction with other participants is done in real-time, time consistency is not always maintained in online virtual worlds. For example, EverQuest time passes faster than real-time despite using the same calendar and time units to present game virtual world is a fairly vague and inclusive term, the above can generally be divided along a spectrum ranging from:massively multiplayer online role-playing games or MMORPGs where the user playing a specific character is a main feature of the game (World Of Warcraft for example). massively multiplayer online real-life/rogue-like games or MMORLGs, the user can edit and alter their avatar at will, allowing them to play a more dynamic role, or multiple roles. Some would argue that the MMO versions of RTS and FPS games are also virtual worlds if the world editors allow for open editing of the terrains if the "source file" for the terrain is shared. Emerging concepts include basing the terrain of such games on real satellite photos, such as those available through the Google Maps API or through a simple virtual geocaching of "easter eggs" on WikiMapia or similar mashups, where permitted.[edit] BoundariesVirtual worlds are well-known as being fantasy spaces sealed off from the real world, but more careful analysis reveals that the boundaries between the real and virtual worlds is quite porous. Participants constantly arrive and depart from the world, carrying with them their unique set of behavioral assumptions and attitudes that cannot be disentangled from their interactions in the virtual world.[8][clarify] For example, in virtual worlds which bring together players from multiple cultural backgrounds, a participant in a virtual world brings their own cultural preconceptions about those other cultures across the boundary into the world while playing. The term magic circle has been used to describe the imaginary barrier between the virtual world and the real world. The fantasy environment of the virtual world is protected from the intrusion of real life by this magic circle, but practices such as the sale of virtual items and virtual currency for real life currency challenges this separation while reinforcing the notion that objects in the virtual world have real life value. In a 2001 study by Edward Castronova, the value of the currency in the MMORPG Everquest was evaluated based on its exchange rate at USD , making this unit of virtual currency of higher value than the Yen or the though Virtual Worlds are most of the time seen as 3D Games, there are many different kinds of it: forums, blogs, wikis and chatrooms where communities born. Places which have their own world, their own rules, topics, jokes, members, etc... Each person who belongs to these kinds of communities can find like-minded people to talk to, whether this be a passion, the wish to share information about or just to meet new people and experience new things. Some users develop a double personality depending on which world they are interacting with. Depending on whether that person is in the real or virtual world can impact on the way they think and act. It is not all about video games and communities, virtual world also plays a part in the social as it can allow people to speak or share knowledge with each other. Best examples are instant messaging and visio-conferences which allow people to create their own virtual world. It can also be used to help hospitalized children (suffering from painful disease or autism for example) to create a comfortable and safe environment which can help Virtual Worlds can be seen as a new way for people to socialize, they are said to be at the heart of a lot of anti-social behaviour. People playing video games online and more precisely, MMORPG are sometimes so addicted to the game that they cannot live without playing it. Such people are called “No Life” or Otaku and spend most of their time in their house not leaving it for days. They are often wrongly treated like insane people and also represented as dangerous when criminal cases imply links with video games. The thing is that video games played online are most of the time designed to be played for a long period of time (and even in the case of World Of Warcraft indefinitely – programmers provide updates and new things to discover regularly). People who abuse this kind of video games end up living most of their live in their bedrooms, do not develop any social life or skills: they communicate with friends mostly via the game or the internet, they create their own life on the internet with a specific name, image and charisma. The example of Second Life is totally unique because players develop communities and businesses in this game. Second Life is a game where the player has to create his/her own character with a human aspect and live a second life in a virtual world. The thing is that some people are so involved in this game (and created their “own self” in this game) that they have a double personality.

本文属于传统议论文，按米电米受米惠米联少多少a米量米惠米联米受米fe联b量惠晓e多b受惠e晓受晓晓晓晓晓少米受晓量晓联照常规行文思路就可以。第一段开头，概括自己的观点：为什么互联网使得世界变小。第二段阐述第一个理由，第三段阐述第二个理由。最后结尾，总结全文本题为互联网使世界变得更小，也就是互联网的出现改变了人们的生活方式，使人与人之间的沟通更方便和紧密，信息比较通畅。其次通过互联网人们也可以实现资源共享，可以在互联网上查询各种自己需要的信息，所以人与人之间的交流不再困难，互联网使世界连在了一起。下面是范文，可以参考：It goes without saying that the Internet is one of the greatest inventions of the twentieth century. It could be seen as a fastest communication medium in the world. Thus, some people believe that the Internet can make the world smaller by re果cing communication gaps among us. To some extent, I agree with this statement because some drawbacks of the Internet can easily be overcome by its advantages in term of of all, to businesses, the Internet has given business people many more chances to manage relationships with their customers and clients quicker and more effectively. In fact, online conferences and chat services implemented on the Internet have lead to an increase in opportunities for person-to-person communication anytime, anywhere. Most these programs are quite cheaper than the cost of travelling long distances to meet and talk directly. Simply, workers just stay at home in front of their computer screens and communicate via the Internet. There are a number of global companies that use the Internet to improve relationships between countries over the world such as Asia, America, Europe, and Africa: Apple, Microsoft, and Coca Cola, for example. Clearly, cyberspace is an ideal environment for communication on our planet, regardless of geographic , the Internet allows people from remote areas to connect with each other and share mutual interests. Some would argue that the Internet makes us more isolated. This truth is, however, that the Internet provides users with a way to communicate across vast distances. People can easily connect with their friends and family who live far away by using e-mail, Skype, and social networks. Let us take the website Facebook as a typical example. This website allows people stay in touch with their family and friends and helps people make new friends around the world. In this way, the Internet brings people close together sum up, the facts display the importance of the Internet. It has almost terminated the most difficult era of communication. The Internet creates a live communication environment for people who live far from their families, as well as business people, so they can form relationships with their partners over the world. Yes, the world is suddenly smaller with the Internet.

第一问：角度减少30分，即减小整圆面积的1/720*π*100*100约等于平方厘米第二问：R增加1cm，即增加的面积等于现整圆面积-原整圆面积再*1/6=（π*101*101-π100*100）/6约等于平方厘米