天（自然规律）不会改变，道（根本法则）也不会改变

I tend to think that the longer you look at a thing, the more abstract it becomes, and, ironically, the more real.

动物的心脏是其生命的基础，是体内一切的主宰。

科学的本质是提出正确的问题。

Propaganda is to a democracy what the bludgeon is to a totalitarian state.