"Our country faces the biggest choice for a generation.

VOA: standard.2009.09.29

So, again, all together, this is the basis for modern chemistry, and examples I just gave you, are some of the things that modern chemists are working on -- some of the issues that our country faces and our world faces, and how chemistry is involved in that.

所以说,所有的这些就是现代化学最基本的基础，我刚给你们介绍的例子,都是现代化学正在研究的东西,一些我们国家和全世界面临的问题，以及它们和化学的关系。

麻省理工公开课 - 化学原理课程节选

So, again, all together, this is the basis for modern chemistry, and examples I just gave you, are some of the things that modern chemists are working on -- some of the issues that our country faces and our world faces, and how chemistry is involved in that.

所以说,所有的这些就是现代化学最基本的基础，我刚给你们介绍的例子,都是现代化学正在研究的东西,一些我们国家和全世界面临的问题，以及它们和化学的关系。

麻省理工公开课 - 化学原理课程节选