Sometimes we get sad about things and we don’t like to tell other people that we are sad about them.

可持续发展不是选择，而是煤炭行业的必然要求。

"The only limit to our realization of tomorrow will be our doubts of today."

 大多数人过着一种平静的绝望生活，他们心中的歌和他们一起埋入坟墓。

Evolutionary psychology is not about what's unchangeable in human nature, but about what was adaptive in our ancestral environment.

如果人们不相信数学是简单的，那只是因为他们没有意识到生活有多么复杂。

最好的书是孩子们想一遍又一遍读的书。