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Open the tool →年久日深 (nián jiǔ rì shēn) is a Chinese idiom (chengyu) meaning “to be deeply rooted or well-established over a long period”.
年久日深 is pronounced nián jiǔ rì shēn in Mandarin Chinese.
Literally, 年久日深 means “years old, days deep”. It is used to mean “to be deeply rooted or well-established over a long period”.
深:远。形容时间久远