世界文明的命运取决于为全人类提供体面的生活水平。
"A man's memory might have only a hundred clear days in it and he has lived thousands."
学者学习古人，开始时接触到的是粗浅的内容，中期接触到精华，最终领悟到其神妙变化。
Biology will relate every human gene to the genes of other animals and bacteria, to this great chain of being.
我不是榜样，我是个角色扮演者。
A proof is a way to convince yourself and others that something is true.