And if you look at sleep and dreams biologically, animals sleep and dream, and they rehearse and they do some other things that help memory and that are a very important part of sleep and dreams.
如果你从生物的角度上去看睡觉做梦， 动物也睡觉做梦， 他们排练，他们做一些其他的事情，帮助记忆 而且那时睡觉和做梦的十分重要的部分。