It's an unwritten law around here that everyone fetches his own coffee, even the managers.
这儿有一条不成文法, 即每人自己去取咖啡, 哪怕是经理也是如此。
A body of unwritten religious precepts.
教义一整套非书面的宗教概念
Britain has an unwritten constitution, and the United States has a written constitution.
英国有不成文的宪法, 美国有成文的宪法.
