来自cross，十字，分叉口，引申义关键的。

1. Talent, hard work and sheer tenacity are all crucial to career success.

事业要成功，才能、勤奋和顽强的意志都至关重要。

2. It is crucial that all documents presented are authentic and easily verifiable.

所有提交的文件必须真实且易于查证，这一点很关键。

3. The ability to separate out reusable elements from other waste is crucial.

能从其他废料中分离出可重复利用成分是很关键的。

4. Nothing seems certain in this crucial period in Pakistan's political life.

在巴基斯坦政治历史上的这个紧要关头,一切皆非定数.

5. Look at the false police reports that omitted or misstated crucial facts.

看看这份失实的警方报告吧，它忽略或歪曲了关键的事实。