1.那些大多是虚构想象 most of them are imaginary. 2.没有任何证据证明外星生物的存在 there is no evidence to prove the existence of alien. 3.其他星球没有水、空气、阳光、适宜的温度等条件支持智慧生物 on the other planet, there is no water, air, sunlight and confortable temperature to support the living of the extraterrestrial intelligence. 4.人们没有发射卫星探测火星前猜测有火星人的存在,卫星探测之后知道火星上没有外星生物 people surmised that there is Martian before we launched the satellite to the mars, after all, there is no alien on mars. 5.外星人的存在与否不能仅仅以在人烟稀少的地方为据,这是没有科学根据的 if there is any alien existed should not on the basis of they are living in where few people live, this has no scientific basis for these claims。