他叹了口气：“好吧，如果你必须知道的话，几天前我试过跑步，在深度及胸的水里，所以没有负重。”

He sighed. 'OK. If you must know, I tried running, a couple of days ago. Through chest-deep water, so it wasn't weight-bearing.

youdao

如果你想以最佳方式到达目的地，你必须知道你要去哪里。

You have to know where you're going if you are to plan the best way of getting there.

youdao

作为交易者，如果想赚钱，你必须知道市场下一步怎么走。

To make money as a trader you have to know what the market is going to do next.

youdao

If the question of time is not explicitly brought up, then you should know that you have to use this formula.

如果时间的问题并没有明确提出,那你应该知道,必须要用这个式子

耶鲁公开课 - 基础物理课程节选

It would be much better if you had a reference point that didn't care where the pressure was.

我们还需要精确地定义气压,你必须知道气压的大小,当然如果我们能找到一个。

麻省理工公开课 - 热力学与动力学课程节选

I know you can't read these characters but just, if you had to tell me, which ones do you like and which ones don't you like ? or how much do you like each one?

我知道你们不会读这些字母,但是，如果你必须告诉我，它们当中，你喜欢哪些词汇,不喜欢哪些,对于每个词，到底有多喜欢？

耶鲁公开课 - 心理学导论课程节选