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Jyutping zung1 duk6 sing3
Pinyin zhòng dú xìng

Definitions (Wiktionary)
  1. noun
    toxicity; poisonousness

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Jyutping zung3 duk6 sing3
Pinyin zhòng dú xìng

Definitions (CC-CEDICT)
  1. poisonous
  2. toxic