








know by heart
be deeply ingrained in one's mind
have a thorough grasp of

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Open the tool →稔熟于心 (rěn shú yú xīn) means “know by heart, be deeply ingrained in one's mind, have a thorough grasp of”.
稔熟于心 is pronounced rěn shú yú xīn in Mandarin Chinese.
“know by heart” is 稔熟于心 (rěn shú yú xīn) in Chinese.