- 释义：
- adj.不成文的；口头的，口传的；没有记录的；白纸一张的
- 例句：
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They sinned against the unwritten rules of this meeting.
他们违反了这次会议的不成文规定.
换一句
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This is an unwritten constitution.
这是一个不成文的法规.
换一句
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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.
换一句