，
;an unwritten constitution.
未成文宪法。
；不成文；
头，空白an unwritten constitution.
未成文宪法。
an unwritten law.
不成文法
an unwritten message
信
unwritten constitution
【律】不成文宪法
documenting unwritten languages.
记录无文字语言。
an unwritten agreement between friends.
朋友间不成文
契
the unwritten laws of good sportsmanship.
运动员精神不成文
则
the unwritten rules of social life.
社会生活中不成文规定。
she had transgressed an unwritten social law.
她违反了不成文社会规
。
They sinned against the unwritten rules of this meeting.
他们违反了这次会议不成文规定。
A powered vessel should give way to sail—it is an unwritten rule of the sea.
机动船在遇到帆船时必须让其先行, 这是一条不成文航行规则。
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