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Jyutping lak6 gaan1 gei1
Pinyin lè jiān jī

Definitions (Wiktionary)
  1. noun
    intercostal muscle; intercostal

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Jyutping lak6 gaan1 gei1
Pinyin lèi jiàn jī

Definitions (CC-CEDICT)
  1. intercostal muscle (between ribs)