您必须在规则运行之前完成这些操作。

You must do this before the rule can run.

youdao

运行之前关闭所有itunes相关服务。

Kill any iTunes-related services prior to running.

youdao

在首次运行之前，必须指定运行的负载和时间。

Before we kick-off a run, we have to specify the load and the duration of the run.

youdao

And if they can't answer that question, I say well, before you even run it, have an answer to that.

如果他们没法回答这个问题的话，我会说好吧，在你运行实验之前，先回答这个问题吧。

麻省理工公开课 - 计算机科学及编程导论课程节选

And I'm going to pause for a minute, before I run it, and ask each of you to compute in your head what you think the answer should be.

我将暂停一会儿，在我运行之前，我想问问你们你们,心算得出的答案应该是什么。

麻省理工公开课 - 计算机科学及编程导论课程节选

I can tell you the answer, but that's because I've cheated, run the program before.

我可以告诉你答案，但这是因为我作弊了，我之前运行过一次程序。

麻省理工公开课 - 计算机科学及编程导论课程节选