首先，志向起着至关重要的作用，因为它是人们取得成功的动力源泉。

Firstly, ambition plays an essential role because it serves as a driving force for people to achieve success.

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不过，一些分析人士说，医生在成本分析中可以发挥作用，因为并不是很多人正在这么做。

Still, some analysts say that there's a role for doctors to play in cost analysis because not many others are doing so.

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许多被宣传为解放了现代女性的家用电器往往起到了相反的作用，因为它们只是改变了工作的性质，而不是消除了它。

Many of the home electric goods which are advertised as liberating the modern woman tend to have the opposite effect, because they simply change the nature of work instead of eliminating it.

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That is to say brick work in high temperature furnaces, maybe tiles on the Shuttle, to resist high temperatures because of the high internal bonding.

它在能够承受高温炉的温度，例如瓷砖，能够耐受高温,因为它们有强的内部键作用。

麻省理工公开课 - 固态化学导论课程节选

And what was happening on the police scanner was really interesting because you had ambulances and fire trucks and police cars constantly reporting where they are and what they're doing.

警用扫描仪的作用,非常有趣,因为救护车,和消防车，还有警车不断地,汇报它们的所在地和它们所做的事。

斯坦福公开课 - Twitter之父Jack.Dorsey演讲：好奇和灵感的力量课程节选

I didn't even need to know that heat capacity of the product, right. Because it's effect the thermal mass of the product is negligible compared to the thermal mass of the calorimeter.

我甚至不需要知道生成物的,热容是多少，因为生成物的,热质量的作用相比于,量热计的热质量是可以忽略的。

麻省理工公开课 - 热力学与动力学课程节选