所有这些因素结合在一起，使组合键成为一种必不可少的技术。

The combination of all these factors may make composite key design a necessity.

youdao

清单 3 中 Retweet 对象上的键将是 tweet id 和转发它的用户的结合。

The key on the Retweet object in Listing 3 will be a combination of the tweet id and the user who retweeted it.

youdao

下面所示的方法将xsl命名键与前面技术中引入的模板结合使用，从而形成了一个解决此问题的可靠解决方案。

The approach shown below USES XSL named keys in conjunction with the templates introduced in the previous techniques to build a robust solution to this problem.

youdao

sigma2sp It's going to be a sigma bond. So, we have sigma 2 s p, carbon 2 s p. So they're two s p bonds combining.

是sigma键，我们有，碳2sp。，所以它们是两个sp键结合。

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