During practice, my teammates would take a break from time to time because they knew what they were doing.

训练期间，我的队友们有时会休息一下，因为他们知道自己在做什么。

youdao

In an era when you can simply buy a CubeSat kit off the shelf, how can we trust the satellites over our heads were developed with good intentions by people who knew what they were doing?

在一个仅是从货架上就能买到立方体卫星装备的时代，我们怎么能相信头顶上的卫星是那些知道自己所为的人出于善意开发的呢？

youdao

I used to think ants knew what they were doing.

我过去一直以为蚂蚁知道它们在做什么。

youdao

They were not paid to do this. They earned their money at other jobs, but dropped what they were doing when the fire bell rang.

VOA: special.2009.05.17

Or whether or not they had no idea what they were doing, and they've given themselves over to this process.

还是说诗人并不完全理解自己写的文字，而是在创作过程中完全超然忘我。

普林斯顿公开课 - 人性课程节选

Of course now I have visited projects and groups helping the poor and seen what they were doing.

当然，现在我已经亲历了许多组织,帮助贫困人口的过程，也看到了他们的工作。

普林斯顿公开课 - 人性课程节选

The division needed someone who sounded like they knew what they were doing, Packard recalls.

FORBES: The sweet smell of oil

"We were looking for artists who were passionate about what they were doing, " Mr. Alpert says.

WSJ: Cultural Conversation: Herb Alpert

It is thinking that those who crowned you king actually knew what they were doing.

WSJ: Bret Stephens: Obama and the Copenhagen Syndrome