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Jyutping laam4 tin1 baak6 wan4
Pinyin lán tiān bái yún

Definitions (Wiktionary)
  1. phrase, idiomatic
    blue sky and white clouds
Examples (粵典–words.hk)
  1. Cantonese
    蓝天白云
    藍天白雲
    laam4 tin1 baak6 wan4
    • blue sky with white clouds