You got an extra hint here in terms of the order, so even if you had just forgotten what I said, sometimes it's not a terrible idea just to put it in the order it's written, that can give you a lot of clues as well.

其实大家还可以发现一个额外的提示，因此即使你忘了我刚才说的，有时候直接按照这个顺序,排列也不失为一个办法，这也可以给你很多提示。

麻省理工公开课 - 化学原理课程节选

It's faster than walking. Sometimes it's faster than the subway.

比走路快，有时候比地铁还快。

喜欢自行车 - SpeakingMax英语口语达人

Chances are you had to pay something for them; they are like a machine.

有时候你还得为他们花钱,他们就如同一台台机器

耶鲁公开课 - 古希腊历史简介课程节选

Sometime later, I will deal with functions of more than one variable, which I will briefly introduce to you, because that may not be a prerequisite but certainly something you will learn and you may use on and off.

再过段时间,我要开始处理多变量函数,到时候我会向你们进行简单介绍,因为那不是必须的,但是你们以后会学到,有时候还能派上用场

耶鲁公开课 - 基础物理课程节选