I realized that many of them were hard to answer, and perhaps others could not be answered at all.

我意识到有许多问题很难回答，也许还有一些根本无法回答。

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And so this is not like a math problem set or a physics problem set. Or, like a high school physics lab, where we all know what the answer should be, and you could fake your lab results anyway.

或是物理问题集合,又或者是高中的物理实验室，我们对这些问题都有确切的答案，或者你可以把你的实验结果改成正确的，有些事情是不能明确界定的。

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Some researchers think they have the answer, and it comes down to the structure of the food, not its chemical composition-a finding that could help rid some processed foods of chemical preservatives.

已有些研究者认为他们找到了答案,这与食物的结构有关,而不是它的化学成分—这一发现使得有些化学处理保存食物的方法无效了。

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And yet the answer could not be more obvious.

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The arrival of sophisticated competition has usurped their dominance, but the validation of the category by the likes of Google and Amazon could provide the answer, not put the kibosh on its survival.

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Bill Richardson, a Democrat, said he wanted to know how many guards were coming to his state, New Mexico, and was discouraged that the White House could not give him an answer.

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