| 单词 | 了如指掌 |
| 释义 | 了如指掌know sth. like the palm of one's hand know very well 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] 形容对情况极为清楚对他们的活动,他完全了如指掌 |
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