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Jyutping maan6 lei5 mou4 wan4
Pinyin wàn lǐ wú yún

Definitions (Wiktionary)
  1. phrase, idiomatic
    the sky is clear and cloudless

萬里無雲 [万-无云]

Jyutping
Pinyin wàn lǐ wú yún

Definitions (CC-CEDICT)
  1. cloudless
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    天上万里无云。
    天上萬里無雲。
    tiān shàng wàn lǐ wú yún 。
    • Not a single cloud could be seen in the sky.