unwritten law

漢語翻譯

英文解釋：

名詞 unwritten law:

1. law based on customary behavior

例句：

1. It's an unwritten law around here that everyone fetches his own coffee, even the managers.
   這兒有一條不成文法，即每人自己去取咖啡，哪怕是經理也是如此。