In that way it would be useful to make a contrast between Aristotle and someone like Adam Smith the great author of The Wealth of Nations.

在这一方面，有用的对比将是,把亚里士多德,与像亚当？史密斯这样人物,放在天秤的两端。

耶鲁公开课 - 政治哲学导论课程节选

I agree is a useful pattern for nodding your head with someone for coming to a similar place.

当你对别人的想法点头称是时，I agree 是一个非常有用的句型。

I agree课堂 - SpeakingMax英语口语达人