Always be wise enough to know that you do not know everything.

时常明智地提醒自己并非知晓一切。

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If you do not know the answer, it is all right to tell the teacher that you do not know.

如果你不知道答案，完全可以告诉老师你不知道。

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Had I filled myself with all that you know what room should I have for all that you do not know?

我若把你所知道的一切来装满自己，那么还有什么空间来装你所不知道的一切呢？

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Montclin did not move. "You know as well as I do that it is no use to tell Athnaise anything,"

VOA: special.2009.06.27

We all know that in a falling elevator, you definitely do not escape the pull of gravity.

我们都知道在一个下坠的电梯里,你当然还是会受到重力的

耶鲁公开课 - 基础物理课程节选

Or perhaps, you could be trying to explain that you don't know whether you can do something or not by a certain date.

又或者，你正在试图解释你没法确定你是否能在一个指定日期前做完某件事。

I don't know 课堂 - SpeakingMax英语口语达人

Here is that secret first step: If you have no experience selling anything to Chinese people or organizations in actual China, admit that you do not know what you are doing.

FORBES: Want To Sell To Chinese Customers? The Secret First Step

The fact that you do not know your blind side from your break down will have no bearing on your enjoyment of the tournament, because much of the action will be off the field.

BBC: A guide to New Zealand��s Rugby World Cup

Sharing files via a cloud system is convenient, of course, but remember that anyone you share files with can share those same files with another party that you do not know and have not specifically given access to.

FORBES: The Cloud's Not-So-Secret Weak Link