Though we may know how to find the information we need, we must also know how to evaluate it.

虽然我们知道如何去查找我们需要的信息，我们还必须知道如何评价它。

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It's hard to know how they can get that information.

很难知道她们如何得到这些信息的。

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They know how to get information on drugs.

他们知道如何得到有关药物的信息。

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Yet they have in fact not responded in kind after years of essentially one-way transfers of information and know-how from the United States to China, and Gates on this trip will not see any military facility not previously opened to U.S. officials.

FORBES: Gates's Misconceived Trip to Beijing

"We are talking about how we know things and how we keep track of things -- and that information could help people take steps to avoid us knowing what they are up to, " said one official.

CNN: US - Weapon information, spy techniques on missing U.S. State Department computer

"I would hesitate to speculate on how long that would take, because I just don't know how much follow-up and additional information might be generated when we take a look at it, " said Dr. Ron DeHaven, deputy administrator of animal, plant and health inspection services for the U.S. Department of Agriculture.

CNN: Canada nears end of mad cow probe