We have theories--mathematical theories-- that lead us to devise financial structures, which are complicated devices just like engines or nuclear reactors.

金融学中的理论,数学理论,能帮助我们构造金融工具,金融工具就像发动机,或者核反应堆一样,都是复杂的工具

耶鲁公开课 - 金融市场课程节选

I mean the technology is, you know, it's a tool to help make a better movie,

我是说，技术是一种帮助我们拍更好的电影的一种工具，

没有特效的话 - SpeakingMax英语口语达人

Also one of the most useful resources you'll find is the course's website; where not only will the obvious be posted like handouts and such, pests in the syllabus, but there will also be a variety of tools that you can turn to over the course of the semester including our own videos.

而且你将发现最有用的资源之一就是课程网站,这里不仅有讲义,教学大纲的错误之处，还有大量课程中使用的工具,包括我们自己的视频等,这对这学习很有帮助。

哈佛公开课 - 计算机科学课程节选

Plato wrote the dialogues as a kind of learning device, as a tool to help the reader get better at doing philosophy.

柏拉图写下这些对话录,是为了将其作为一种助学方法,作为一种帮助读者,更好的掌握哲学的工具

耶鲁公开课 - 死亡课程节选

A few things about logistics of the class to help you guys navigate through various electronic things that the class has at the moment.

课程的流程可以帮助大家,利用课程现有的电子工具

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选