了如指掌 瞭如指掌
liǎo rú zhǐ zhǎng
Meaning
to know sth like the back of one's hand (idiom); to know (a person, a place etc) inside out; variant of 了如指掌 liǎo rú zhǐ zhǎng
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Examples
他对纽约了如指掌。
Tā duì Niǔ yuē liǎo rú zhǐ zhǎng.
He knows New York inside out.