The first step is knowing which foods are better options when it comes to energy density.

谈到能量密度第一步即应了解哪些食品更适合我们选用。

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The toughest part of working with XML is often just knowing which tool is best for a specific application.

使用 XML 时最困难的部分通常就是了解哪个工具最适合于某个特定的应用程序。

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I remember knowing which ones my friends had and negotiating terms to play for them and collect all of them.

我还想起了那时候知道我的朋友们有什么样的弹球后去跟他们谈条件，通过比赛去赢得人家的弹球，还想把那些弹球全部收入囊中。

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He says knowing which areas of the system are going to cause future problems will make the effort worthwhile, even if the goal of fifteen million is not reached.

VOA: special.2010.04.28

So each of these cups again have different weights if I want to find the lightest of them I might start not knowing which is which.

它们的重量互不相同，如果我要,找出最轻的一个，而我根本不知道会是,哪一个。

哈佛公开课 - 计算机科学课程节选

And perhaps this is that doom which Adam fell into of knowing good and evil, that is to say, of knowing good by evil.

似乎是注定了的，亚当要掉进善恶的知识中,也就是说，了解善恶。

耶鲁公开课 - 弥尔顿课程节选

By knowing which electrodes were triggered, it is possible to determine what agent is present.

FORBES: Nanotech Takes On Homeland Terror

What do you think of the idea of knowing which Facebook users are nearby?

CNN: Facebook pulls location-tracking feature

The technology just might make schools better at quality control -- knowing which instructional techniques work and when.

FORBES: Instant feedback in the classroom