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Jyutping fei1 zyu2 lau4
Pinyin fēi zhǔ liú

Definitions (Wiktionary)
  1. noun, attributive, often
    non-mainstream; underground; alternative

非主流 [---]

Jyutping
Pinyin fēi zhǔ liú

Definitions (CC-CEDICT)
  1. alternative
  2. non-mainstream