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Jyutping lou4 zi1 gwaan1 hai6
Pinyin láo zī guān xi

Definitions (Wiktionary)
  1. noun
    industrial relations; labour relations

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Jyutping lou4 zi1 gwaan1 hai6
Pinyin láo zī guān xì

Definitions (CC-CEDICT)
  1. industrial relations
  2. relations between labor and capital