一切迄今为止社会的历史都是阶级斗争的历史。

The most rewarding part of research is seeing your work translate into real-world impact.

Children are not just miniature adults; they have their own way of seeing and understanding the world.

A classic is a book that has never finished saying what it has to say.

大陆漂移的第一个概念早在1910年就出现在我脑海中，当时我正在看世界地图。