每一个发现都是我们宇宙拼图的一块。
It is not because certain things are difficult that we do not dare;it is because we do not dare that things are difficult.
I earnestly wish to point out in what true dignity and human happiness consists.
一本书是一面镜子;如果一个傻瓜往里看,你不能指望一个智者往外看。