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1·They obey the one unwritten rule that binds them all–no talking.

他们遵守那条约束他们所有人的不成文规定—不许说话。《柯林斯英汉双解大词典》

2·He bore the unwritten rule in mind.

他牢记那条不成文的规矩。

3·This soon became an unwritten rule in Britain and Ireland.

这在英国及爱尔兰很快就成为一条不成文的规定。

4·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。

5·It was an unwritten rule that what the teachers said was always right.

书上并没有写老师就一定是正确的。

6·The monthly salary of new employee is 1500 RMB, it's an unwritten rule.

新员工的月薪为1500元，这是个不成文的规定。

7·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行规则。

8·Soldiers' combat clothing is not supposed to be ironed, according to an unwritten rule.

有一条潜规则，说的是士兵们格斗装不能用烫斗去烫。

9·Newcomers can ask those people to alert them when they've unknowingly violated an unwritten rule.

新人们可以请这些人在他们不知情地违反规矩时及时的提醒他们。

10·I had an unwritten rule that if someone took the time to write, I would give the courtesy of an answer.

我对自己有个不成文的要求，既然有人花时间给我写信，我就应该出于礼貌给他们回信。