☉ 了如指掌 【liǎorúzhǐzhǎnɡ】
[ 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 ] 形容对情况极为清楚。
例: 对他们的活动,他完全了如指掌
[ 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 ] 形容对情况极为清楚。
例: 对他们的活动,他完全了如指掌
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