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Jyutping hok6 hoi2 mou4 ngaai4 kan4 si6 ngon6
Pinyin xué hǎi wú yá qín shì àn

Definitions (Wiktionary)
  1. phrase, idiomatic
    knowledge is infinite like a boundless ocean; only through diligence in studies can one make accomplishments
    (syn.) 學海無涯, 唯勤是岸, 学海无涯