Any time there is a threat of biological or che mical attack, the first thing you hear about is gas masks.

任何时候，只要有化生威胁，你首先听到的讨论就是防毒面具。

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The acids in the food begin to attack and dissolve the metal lining of the can, and one of the by-products of this chemical reaction is hydrogen gas.

食品中的酸性物质开始溶解罐的金属内层，这种化学反应会产生氢气。

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The paper presents an experimental study on the back-attack phenomenon in underwater supersonic gas jets.

对水下超声速气体射流的动力学行为进行了实验研究。

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No prizes for guessing what is used in a simulated tear-gas attack: a canned air-freshener.

CNN: THE SOUNDS OF CONFLICT

With the Chemical Weapons Convention (CWC) awaiting action by the U.S. Senate, the treaty's supporters are asserting that the Tokyo subway poison gas attack demonstrates the need for U.S. ratification.

CENTERFORSECURITYPOLICY: Blowing Smoke About Making Deadly Gas

Stubby, as the dog became known, comforted the wounded and was devoted to his comrades, warning them at one point of a gas attack and giving them time to don their gas masks.

WSJ: Letting Slip the Real Dogs of War