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Meaning of 了如指掌

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liǎo zhǐ zhǎng
to know sth like the back of one's hand (idiom); to know (a person, a place etc) inside out
Example Sentences
1
But do we know really know ourselves?
2
He knows the terrain of this locality like the back of his hand.
3
Can you know everything going on in your field or industry?
4
Sensors everywhere: Your phone knows a lot about the world around you.
5
But don't act as if you know everything about the place.