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。

柯林斯例句

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.

《简明英汉词典》

He bore the unwritten rule in mind.

他牢记那条不成文的规矩.

辞典例句

Newcomers can ask those people to alert them when they've unknowingly 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.

互联网

Although the focus in cheerleading is on athletics , it's an unwritten rule that appearance counts.

而最困难的事情就是要让队里所有的人一直在精神和体能上都保持良好的状态.

互联网

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.

互联网