And so, when you think about how much cement concrete are consumed annually on the planet, this becomes a considerable point source of greenhouse gas emissions.

当你想到,在地球上每年要消耗多少的水泥混凝土的时候,这将是温室气体排放的,一个主要来源。

麻省理工公开课 - 固态化学导论课程节选

Every year that it's held, we invite a bunch of nonprofit organizations

每年举行的时候，我们都邀请一些非赢利组织，

关于自由和时尚 - SpeakingMax英语口语达人

We're going to talk a lot about antibodies, we're going to talk about antibodies in section, and at the end of the course, our last section meeting every year we get together and we talk about which sections did you think were useful and which parts - which sections were not so useful.

我们会讲不少有关抗体的内容,在分组讨论会里会继续讲抗体,课程结束的时候,在每年最后一场讨论会上我们会讨论,分组讨论哪一节有用,哪一节没用

耶鲁公开课 - 生物医学工程探索课程节选