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Open the tool →了然于胸 (liǎo rán yú xiōng) is a Chinese idiom (chengyu) meaning “to understand something thoroughly and clearly”.
了然于胸 is pronounced liǎo rán yú xiōng in Mandarin Chinese.
Literally, 了然于胸 means “Understand clearly in one's heart/mind”. It is used to mean “to understand something thoroughly and clearly”.
了然:了解、明白。心里非常明白。