化合价的概念是理解化学键的关键。

There is no such joy in the tavern as upon the road thereto.

No man should judge unless he asks himself in absolute honesty whether in a similar situation he might not have done the same.

I'm not a businessman, I'm a business, man.

I'm a failed poet. Maybe every novelist wants to write poetry first, finds he can't, and then tries the short story, which is the most demanding form after poetry. And, failing at that, only then does he take up novel writing.