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Jyutping zai3 tin1
Pinyin jì tiān

Definitions (Wiktionary)
  1. noun, archaic, historical
    to offer sacrifices to heaven
    (syn.) 郊天
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    燔柴祭天是一种古老的仪式。
    燔柴祭天是一種古老的儀式。
    fán chái jì tiān shì yī zhǒng gǔ lǎo de yí shì 。
    • The Heavenly Timber Immolation is a kind of ancient ritual.