unwritten是什么意思？

unwritten

例句

• 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, 这是一条不成文的航海规则。
• His behavior transgressed the unwritten rules of social conduct. 他的行为违反了不成文的社交规范.
• They sinned against the unwritten rules of this meeting. 他们违反了这次会议的不成文规定.
• The missive remains unwritten and unsent. 这件公文未写也未发出去.
• They obey the one unwritten rule that binds them all—no talking. 他们都遵守着那条约束他们所有人的默认规则——要守口如瓶。