有一天，一位教授走进教室，告诉学生们他们马上要进行一次考试。

One day a professor entered the classroom and told the students they would have a test right away.

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这一周他们在进行一次考试。

They're having a test this week.

youdao

这一周他们在进行一次考试。

They 're having a test this week.

youdao

And as a reminder, hopefully I don't need to remind any of you, but exam 1 is on Wednesday, so rather than our clicker question being on something from last class, which is exam 2 material, let's just make sure everyone remembers some small topic from exam 1 material, which is the idea of angular nodes.

而作为一个提醒--我希望大家都不需要提醒，但是这周三就要进行第一次考试了，因此我们的这个选择题,不是关于上节课内容的，那是第二次考试的内容，这里只是想确认大家都记得,第一次考试所要求的一些小问题，也就是关于角向节点的概念。

麻省理工公开课 - 化学原理课程节选

And um, eventually, at first, I was just, you know, sitting in, but then I had to take a licensing exam

一开始我只坐在那里，可是之后还要进行一次许可考试，

广播人员怎么样？ - SpeakingMax英语口语达人