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We need to know the exact time the incident occurred.

我们需要了解事情发生的确切时间。

《牛津词典》

We need to know whether the crime had been premeditated.

我们需要知道犯罪是否有预谋。

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In her words, "We need to know how using credit fits into our plans and goals."

VOA: special.2009.05.22

Also, we need to know how much individual stocks are correlated with rm; we measure that by the regression coefficient.

我们必须清楚,有多少个股与市场总体收益率相关;,我们用回归系数，即β系数来表示。

耶鲁公开课 - 金融市场课程节选

The second piece of information we need to know is what actually the kinetic energy is of the ejected electron, and that's something we can just measure by measuring its velocity.

其次，我们需要知道的信息是,出射电子的动能，这可以通过,测量它们的速度得到。

麻省理工公开课 - 化学原理课程节选

As marketers, we need to know who the brokers are and then bring them something novel.

FORBES: Connecting marketers to the Forbes audience. What is this?

Thirdly, we need to know what will be the effect of any particular temperature rise.

FORBES: Climate Change Is Now Less Of a Problem. So We Need To Do Less About Climate Change

What we need to know is this: did these seeps exist before the cap test began?

FORBES: BP Oil Seeps: Should We Be Worried?