钟在打点前先嘎啦嘎啦地响起来。

The clock began to whirr before striking the hour.

《牛津词典》

讲话前先感谢大家光临，这是惯例。

It is usual to start a speech by thanking everybody for coming.

《牛津词典》

工作人员在兑现支票前先把它复印了。

Staff photocopied the cheque before cashing it.

《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