台Taivo A Taiwan Mandarin dictionary

了然於胸

liǎorányúxiōng

ㄌㄧㄠˇ ㄖㄢˊ ㄩˊ ㄒㄩㄥ

Simplified 了然于胸

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  1. 1(idiom) to be well aware; to understand clearly

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