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Jyutping zam1 zai1
Pinyin zhēn jì

Definitions (CC-CEDICT)
  1. fluid loaded into a syringe for a hypodermic injection
Definitions (Wiktionary)
  1. noun
    medication administered as an injection
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)