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插入导管前先要进行检查。

An examination is carried out before the insertion of the tube.

《牛津词典》

我们在把东西归档前先给它们贴上标签。

We attach labels to things before we file them away.

《柯林斯英汉双解大词典》

Well, let's just give a teaser of some of the details before we move on to actual interesting functionality.

在转去介绍,其他更实际有趣的知识前,我先让大家注意一个小细节。

哈佛公开课 - 计算机科学课程节选

I mean there are definitely other ways around that and by justifying, no, hang on, hang on, before you laugh at me.

我是说，一定有其他变通的办法,通过判定。。。，不对不对，等等，趁没嘲笑我前我先改正。

耶鲁公开课 - 公正课程节选

Maybe somebody who knows Citizen Kane and would like to have a grade for the first 50 pages.

也许比较清楚了解的同学可以做,需要先读前50页的内容。

麻省理工公开课 - 电影哲学课程节选