主要的义务规则是那些要求或禁止某些行为的规则。
The primary rules of obligation are those that require or forbid certain actions.
你最好别吃了饭不付钱就跑……那些为了每小时三块钱辛苦工作的人不得不替你付账。
We cannot change, we cannot move away from what we are, until we thoroughly accept what we are.