It's a species close to human, with several advantages over mice: They're free, you don't shave them, they feed themselves, and nobody pickets your office saying, "Save the lab medical student."
是接近人类的一个物种， 跟老鼠相比有以下几个好处： 不用付费，不用给他们剃毛，不用喂养他们 没人查你的办公室，还要说： “管好你实验室的医科学生。”