It is a curious subject of observation and inquiry, whether hatred and love be not the same thing at bottom.

Well, the first rule is that you can’t really know anything if you just remember isolated facts and try and bang ’em back. If the facts don’t hang together on a latticework of theory, you don’t have them in a usable form.

空间是一种物质。

效率是把事情做对，而效能是做对的事情。