2. to know something like the back of one's back 了如指掌
He's lived in this city all his life. He knows it like the back of his hand.
他在这座城市住了一辈子,对这里可以说是了如指掌.
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He's lived in this city all his life. He knows it like the back of his hand.
他在这座城市住了一辈子,对这里可以说是了如指掌.