研究者解释说，由于需要不开包装检查，因此药物真伪鉴别比较困难。

Verification can be difficult, the researchers explain, because medications must be analyzed without opening the product package.

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研究者解释说这些不同的行为是由于大脑结构和活动上的根本性不同。

Researchers say these behaviors are due to basic differences in brain structure and activity.

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遭受炭疽攻击后，直到毒素在血液里循环的时候，人们才知道受到了感染。研究者解释说，这时可能已经太晚了，单独用抗生素已不怎么见效。

After an anthrax attack, people may not know they are infected until the toxins are circulating in their blood, and it may be too late for antibiotics alone to be effective, the researchers explained.

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Jahan Ramazani, who is the editor of The Norton and a great Yeatsian, he himself has decided that all this is too much to explain and you don't really need it.

贾汗，拉马扎尼，诺顿的主编,也是个伟大的叶芝研究者,他说这些要解释得实在太多,你们真的不需要。

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