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Jyutping mou4 sai3 zi1 hei3 gun2
Pinyin máo xì zhī qì guǎn

Definitions (Wiktionary)
  1. noun
    Synonym of 細支氣管/细支气管 (xìzhīqìguǎn, “bronchiole”).
    (syn.) 細支氣管, 细支气管