◎了如指掌liǎorúzhǐzhǎng
[have sth.at one’s fingertips; know as one know his ten fingers; know like a book; know as well as a beggar knows his bag] 形容對情況極為清楚
對他們的活動，他完全了如指掌
更多關于了如指掌的詞語解釋
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