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.
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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