人们被迫戴着面具，避免呼吸有毒空气。

People are forced to wear the mask to avoid breathing poisonous air.

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即使在当时，可能会有呼吸困难，需要氧气，以给予的面具。

Even then, there may be breathlessness requiring oxygen to be given by mask.

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即使在当时，可能会有呼吸困难，需要氧气，以给予的面具。

Even then, there may be breathlessness requiring oxygen to be given by mask.

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