The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.

我认为在任何结束的关系中都要有一个了结，无论是恋爱关系还是友谊。

I can be no longer than one day absent from the ship, as I am the only person on board who can navigate her.

The only way to learn mathematics is to do mathematics.

最好的歌曲是那些让你感觉活着的歌。