I hope you know what you are doing.

但愿你知道你在做什么。

youdao

I would say yes if you know what you are doing.

我回答是，如果你知道自己在做什么。

youdao

But with bees, you need to know what you are doing.

但是，养蜜蜂，你必须知道自己在干什么。

youdao

In everyday speech, holding your cards close to your vest means not letting other know what you are doing or thinking.

VOA: special.2009.11.22

Okay. Now this gentleman out here is actually doing it different from what I am doing and what most of you are doing but you know what? He's doing it correctly.

这位先生,和我做的不太一样,甚至和在座各位做的不太一样,但你知道吗,他做的是对的

耶鲁公开课 - 聆听音乐课程节选

You know, you become expert on what you are doing. You learn more things.

如果你想成为你领域里的专家，那么你必须学习更多的东西。

研究生院也在这里 - SpeakingMax英语口语达人

You'd better know what you are doing, or you might set fire to something.

FORBES: Tangerine Flake Streamline Baby

Be willing to go beyond the flawed indexes, if you know what you are doing.

WSJ: Investing in Emerging Markets Isn't for Amateurs

Do what you know and know what you are doing at all times.

FORBES: Ten Tips To Clear Your Portfolio's Dead Weight