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exhalation valve /ɛkshɐlˈeɪʃən ˈvalv/ n

中文：呼气阀

中文 · 呼气阀Español · válvula de exhalaciónFrançais · soupape expiratoire
Meaning：Device that allows air to be expelled from the mask.
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Half-mask respirator Respiratory protective equipment

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