This apparently walks back from a Bush-era declaration that underscored the possibility that the United States might use nuclear weapons if it suffered a chemical or biological attack.

这显然是走回布什时代的宣言，强调了美国可能会使用核武器如果它受到了化学或生物武器的袭击的可能性。

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According to recent studies, a caterpillar can sense when a plant is about to unleash its chemical weapons and counter by producing anti-toxins to neutralize the plant's attack.

据最新研究表明，毛毛虫可以感应植物何时准备释放“化学武器”，而分泌有毒物质抗体，与植物抗衡。

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Ten people packed into a sweltering bunker near the Iraqi border seconds after a chemical weapons attack, looking for direction on what to do next, and who was in charge?

在遭到化学武器袭击后我们十个人马上就挤在伊拉克边缘地区的一个蒸笼般的掩体里。下一步应该怎样做呢？谁会成为领导人呢？

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This week the French announced the arrest of what appears to be an al-Qaida cell whose members were planning a chemical weapons attack on the Paris subway.

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An analysis of video of hospitalized Syrians released by state-run TV suggests people are not suffering from a chemical weapons attack, nor are they being treated as though they were in such an attack, the U.S. military official said.

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The document will say "there remains a narrow range of contingencies in which the option of using nuclear weapons can play a role in deterring large-scale conventional, chemical or biological attack, " he said.

WSJ: U.S. Keeps First-Strike Nuclear Strategy