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Jyutping gaai3 zi2 hei3
Pinyin jiè zi qì

Definitions (Wiktionary)
  1. noun
    mustard gas
    (syn.) 芥子毒气, 芥子毒氣

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Jyutping gaai3 zi2 hei3
Pinyin jiè zǐ qì

Definitions (CC-CEDICT)
  1. mustard gas