youdao

You do not know whether what you're told is true or false.

你不知道别人告诉你的是真的还是假的。

《柯林斯英汉双解大词典》

You do not know where to start.

你不知道从哪里开始。

youdao

He told the president, "You do not know the dishonest purposes of those men as well as I do."

VOA: special.2009.08.13

But, you know why not do something a little special, little different, and they decided instead to use lithium.

但是你懂的，为什么不做的更特殊，更与众不同一些呢？

麻省理工公开课 - 化学原理课程节选

Usually when you know why it's not working, it's obvious what you have to do to make it work.

通常你明白了出错的原因后，很明显你必须让程序正常运行起来。

麻省理工公开课 - 计算机科学及编程导论课程节选

However, in your next big deal, what you do not know will kill you.

FORBES: Remaking Your Brand: Playboy Style

When all bets are off, you do not know where to lay your money down.

FORBES: Strategy, The One "Do" Amidst the Don'ts -- Wrapping Up "The 10 Don'ts of Corporate Social Media" Series

If you do not know the ROI on different initiatives, decision making is made that much harder.

FORBES: 15 Lessons I Learned From 15 Years In Business