11.人非圣贤，孰能无过?
It’s just human to make mistakes.
12.许多人始终遵循“你敬我一尺，我敬你一丈”的处世原则。
Many people live by the principle: nice to me and I’ll be nicer to you.
13.这就叫作：投之以桃，报之以李。
This is what people say “a good turn deserves another”.
