"When he selected his models, he had them audition to make sure they could do the facial expressions he wanted, that they could act out the body language he wanted for a particular picture."

VOA: standard.2010.08.09

So you can see right away the students knew that they will be selected as a very honor to the pool.

所以，学生们很快,就会知道他们将成为,该组织的荣耀。

麻省理工公开课 - 媒体、教育、市场课程节选

Another way to talk about different types is to think about which ion they're selected for.

另一种方法是通过,看它们是针对哪种离子的。

麻省理工公开课 - 化学原理课程节选