Certain expressions - such as in - apply to a variable number of expressions.

某些表达式(比如in)可以应用到多个表达式。

youdao

Students can apply to become resident assistants after living in the dorms for a year.

VOA: special.2009.03.26

This is how we address that purpose of education to give students an opportunity to apply in practice what they have learnt.

借此，我们确立了,教育的目标之一,即给学生机会,将所学知识用于实践。

麻省理工公开课 - 媒体、教育、市场课程节选

It's 71 or whatever so that if condition doesn't apply, but now what do I do in this next line?

它似乎71或者其它的，如果条件不适用，在下一行我做了什么？

哈佛公开课 - 计算机科学课程节选

Now, the Court may decide that if it doesn't apply in this case, it probably can't apply in any case.

WHITEHOUSE: President Obama Makes a Statement on the Sequester

Another significant feature launched very recently is a new web plug-in: Apply With LinkedIn.

FORBES: LinkedIn Boosts User Engagement But Stock Still Stinks

Dr Jackson and her colleagues were called in to apply terahertz imaging to find out what lay beneath.

BBC: Terahertz scanner reveals hidden fresco at Louvre