Today, we will talk about EMRG (电磁轨道炮). You might be bored with all the following theories. If so, the background movie could be a good Rail Gun is one type of Electromagnetic guns(电磁炮) wich also include ETG (电热炮) and so on. Electromagnetic rail gun is a kind of concept weapon(概念武器). It uses Lorentz force(洛伦兹力) to launch the is made up of two parallel(平行的) rails and a armature(电枢). According to Ampere's law (安培定律), the current moving along the straight wire will produce a magnetic field(磁场).When free electrons (自由电子) come cross the magnetic field, its trajectory (轨迹) will become bent (弯曲) by forces. This forces are named as Lorentz force based on the Dutch physicist . Lorenz’s is a video about the Lorentz the current moves along the rails, it will produce a magnetic field. Then the armature is moved away by Lorentz force. Lorentz force speeds up the armature and the wire faster and faster. This is the theory of means that we can use electric to launch anything. .: bullets, cannonballs or even we call it, ‘a concept weapon’, it isn’t a pure weapon. In fact, we can use it in many other fields. We can power on the railway using the Lorentz force. Its cost is far more lower than the maglev train (磁悬浮). In terms of Industrial Field, we can use the electromagnetic beam-pumping unit instead of the traditional beam-pumping unit (磕头机). And we also can launch spacecrafts and missiles in a more convenient and cheaper am very interested in the EMRG. This is the project that I am involved.I believe that the Statue of Liberty will be ruined by our navy in the future. We will build a sculpture of chairman instead of it. And then throw the hateful English into the rubbish the cup(杯具) is that we have to learn it well first today.