了如指掌

英文拼写：have things at one's fingertips

英文例句

- know ... like the palm of one's own hand; as plain as pointing to one's hand; be thoroughly familiar with ...; clear like pointing at a palm; have fully grasped a subject, a situation, etc.; have sth. at one's fingertips; know ... as a person knows his

>查看了如指掌的汉语解释

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