了如指掌

liǎo rú zhǐ zhǎng

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释义

  1. 1. to know sth like the back of one's hand (idiom)
  2. 2. to know (a person, a place etc) inside out

了如指掌 的构成词

了
le

(completed action marker)

如
rú

as

指
zhǐ

finger

了
liǎo

(of eyes) bright

掌
zhǎng

palm of the hand