So realize you don't have to get it right the first time, but you have to listen and watch to what actually those problems are and that is one of the roles your teaching fellows play.

请认识到，并不是要你第一次就把事情搞对，但是你必须听听，看看,问题是到底什么，这也是你们的助教,扮演的一个角色。

哈佛公开课 - 计算机科学课程节选

There is clearly some kind of an official group that has some sort of political role to play, which is popular in its character.

很显然需要有一个官方组织,扮演某种政治角色,从属性上来说这很常见

耶鲁公开课 - 古希腊历史简介课程节选

Next time let's talk about identity, and let's talk about one of my favorite topics, the role of the schools in towns and in villages.

下次我们要讲同一性,要讲我最喜欢的一个话题,城镇和农村的学校所扮演的角色

耶鲁公开课 - 1871年后的法国课程节选

Because these things are unpaired, we have already seen how unpaired electrons play a role in the Stern-Gerlach experiment.

因为它们都是未成对的，我们已经发现,在Stern-Gerlach实验中,未成对电子扮演怎样一个角色了。

麻省理工公开课 - 固态化学导论课程节选

Farms are an interesting part of this.

农业扮演了一个非常有趣的角色

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选