With chemical testing, knowing which genes to modify is hard.

用药物进行实验，要知道那种基因需要改良比较困难。

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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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An important aspect of dealing with the tag is knowing which components go with which states.

处理标签的一个重要方面是知道哪些组件有哪些状态。

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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