And it tells about the role Chinese workers played in helping to build America into an industrial power.

VOA: special.2010.03.03

They decide they're going to have a bonfire and they build this giant fire and into it they throw everything from the past.

他们决定要燃起一堆篝火,将之化为熊熊烈焰,将过去的一切尽抛其中

耶鲁公开课 - 美国内战与重建课程节选

And the aeronautics engineer who wants to build an airplane has to obey, take into consideration, learn it, study and understand the law of gravity.

航空航天工程师,想制造飞机，必须遵守，加以考虑，学习，研究理解万有引力定律。

哈佛公开课 - 幸福课课程节选