化学威胁需要不同的防护手段，因为化学品以雾或蒸气的形式存在，微粒过滤器对它们无效。

A chemical threat needs a different approach, because chemicals come as mists or vapors that are largely immune to particulate filtration.

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接下来，被埋藏的有机物质中的一部分通过缓慢的化学反应转化为油雾雾珠和气泡。

Then some party of the organic materials must be transformed by slow chemical reactions to oil droplets and gas bubbles.

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化学性能测试：材料的盐雾试验、不锈钢腐蚀试验等。

Chemical property testing: salt spray test of materials, corrosion test of stainless steel.

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