customary
词根词缀：
词根
custom= habit 习惯
accustom v. 使习惯
ac 加强 + custom 习惯 → 使习惯
customary adj. 习惯性的
custom 习惯 + ary …的 → 习惯性的
customer n. 顾客
custom 习惯 + er 表名词 → 习惯〔进商店的〕人 → 顾客
数据来源：新东方英语词汇速记大全
相关例句：
Do you really think it's customary to tip the waiters?
你真的认为给侍者小费是约定俗成的吗？
They interrupted the customary one minute's silence with jeers and shouts.
他们讥讽着，喊叫着，打破了惯常的那一分钟沉默。
It had never happened to me. I am not customary not to gain anything.
它从未发生在我身上，我不习惯不获取任何东西。
Customary law plays a role together with the statutory law in the application interpretation of criminal law.
习惯法在刑法适用解释过程中，同制定法一起发挥作用。
The king carried himself with his customary elegance
国王保持着一贯的温文尔雅。
Any customary observance or practice.
一种习惯的仪式和惯例。