A big problem with database triggers is that the application does not know that they exist, therefore does not know whether they have run or not.

应用程序是感知不到触发器的存在的，因此也不知道他们运行了还是没有，这是一个大问题。

youdao

Often, users do not know what they want; or if they do, they don't know how to describe it.

用户常常不知道他们要的是什么，或者知道是什么却不知道怎么描述它。

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When a person is healthy - he says «I do not know» in only one case - when is is really something he does not know or he is unaware that he knows it.

当一个人处于健康的状态时——他只在一种情况下说«我不知道»——当他真的不知道或者他没有意识到他知道的时候。

youdao

In a poker game you do not want to let your opponents know if your cards are good or bad.

VOA: special.2009.11.22

So, that's a homogeneous system, one phase. You have to know if your system is an equilibrium system or not.

所以这是个均匀系统，只有一个相，你得知道你的系统,是不是个平衡系统。

麻省理工公开课 - 热力学与动力学课程节选

The heroine of the mask, as you know, doesn't seem to have a Christian name. She's not Britney or Lindsay.

你们也知道《面具》里的女主角，似乎没有教名，她不是布兰妮或林赛。

耶鲁公开课 - 弥尔顿课程节选

And all the while the American dream shrivels and Obama seems either not to know or not to care.

FORBES: Competency, Not Ideology, Is What Will Determine The Election

Rarely do I actually take the time away from my family to send an email to someone who I do not know and who CLEARLY does not know me, or the other tens of thousands of "career" women in this country.

FORBES: Readers Say

While it's clear that meteorologists who chase know how not to interfere or know how to keep major road stems free of traffic, it's not clear that others do.

CNN: Why we chase storms