Sharks play an important role in the food chain.

VOA: special.2009.04.03

So the link of the conflict will play a stronger role in making the humanitarian issues more important.

因而冲突的纽带将会发挥更大的作用,使得人道主义问题更加重要。

普林斯顿公开课 - 人性课程节选

I think that America has an important role to play to have the standards increased.

我觉得美国在提高标准方面扮演着重要的角色。

爱护小朋友 - SpeakingMax英语口语达人

So although the New Critics were fed up with philological criticism, I don't mean to be condescending toward it or to suggest that it didn't play a crucially important role in the evolution of literary studies.

所以，虽然新批判主义,对语言学批判主义不满，但是并不是要否认语言学批判主义,在文学研究发展过程中,起到的重要作用。

耶鲁公开课 - 文学理论导论课程节选

Mechanisms like habituation, classical conditioning and operant conditioning are real; they can be scientifically studied; and they play an important role in the lives of animals and probably an important role in human lives as well.

诸如习惯化，经典条件作用，操作性条件作用之类的机制,都是真实存在的;,这些机制都能得到科学的研究;,它们在动物的生活里起到了重要的作用,或许在我们人类的生活中,也同样起到了重要的作用。

耶鲁公开课 - 心理学导论课程节选