15.the rule
(normal condition)常例;惯常的事
Violence was the rule rather than the exception.暴力事件是常事, 而不是例外。
For most people, seven hours' sleep a night is the rule.大多数人每晚惯常睡七个小时。
in a country where carpets are the exception rather than the rule在一个甚少使用地毯的国家