They sinned against the unwritten rules of this meeting.
他们违反了这次会议的成规定。
They sinned against the unwritten rules of this meeting.
他们违反了这次会议的成规定。
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, 这是一条成的航行规则。
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