About two-thirds of those went by outright sale, by financial speculation, in now a growing huge American business of the domestic slave trade.

大约有三分之二的人都被,金融投机所买断,被投入一个日益庞大的,国内奴隶贸易的美国商业市场

耶鲁公开课 - 美国内战与重建课程节选

so that's great that a lot of people have enough time to be in something that's not math or science related.

很多人投入了时间，来做与数学或科学无关的事情，这真的太好了。

积极参与俱乐部活动 - SpeakingMax英语口语达人

So this advertisement tells you that the great classic of modernism is something you stride into like a man, but you don't have to be a particularly extraordinary man to do so.

这广告告诉你们现代主义的伟大经典,在于让你们如男人一样勇敢地投入阅读，但你不一定非得成为特别出众的人来阅读。

耶鲁公开课 - 1945年后的美国小说课程节选

If you don't pay people, they are more committed to the cause.

如果你不付钱给这些人，他们就对竞选更加投入。

耶鲁公开课 - 心理学导论课程节选