大厅四周都是门，但都锁着。

There were doors all around the hall, but they were all locked.

youdao

对我而言，在需要学习一门新语言时，我可以从头到尾阅读一本教科书，但一周之后我就会完全忘记书里讲了些什么。

For me, when it comes to learning a new language, I can read a textbook from cover to cover, but a week later I've forgotten it all.

youdao

该项目的报告显示，每两周就有一门语言灭绝。

The project reports that a language becomes extinct every two weeks.

youdao

We're going to spend quite of bit of time talking about it during the third week of the course.

我们在这门课程进行到第三周时,会花一定的时间来讨论它

耶鲁公开课 - 生物医学工程探索课程节选

We'll try to make sure everybody's schedule is accommodated, and you'll either meet on Thursdays or Fridays, in discussion sections,and we'll organize those sections closer to the end of the shopping period, when we have a better idea who will be in here.

我们会尽量选大家都有空的时段，不是周四就是周五，这些讨论环节,会在选课周临近结束前决定，这样我们可以知道谁选了这门课。

耶鲁公开课 - 新约课程节选

So what are the expectations over the course of these few weeks?

那么短短数周,在这门课上你们需要做的是什么？

哈佛公开课 - 计算机科学课程节选