这个词是什么意思？
Respiratory protective devices designed to achieve a close seal around the nose and mouth to maintain efficient filtration of aerosolized particles and droplets. They are often fitted for the prevention of the spread of infections (e.g. COVID19) or to administer inhaled anesthetics or other gases.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D000087162 · MeSH 2026。
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