了如指掌 [ㄌㄧㄠˇ ㄖㄨˊ ㄓˇ ㄓㄤˇ; liao3 ru2 zhi3 zhang3]
to know sth like the back of one's hand (idiom)
to know (a person, a place etc) inside out
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瞭如指掌 [ㄌㄧㄠˇ ㄖㄨˊ ㄓˇ ㄓㄤˇ; liao3 ru2 zhi3 zhang3]
variant of 了如指掌[ㄌㄧㄠˇ ㄖㄨˊ ㄓˇ ㄓㄤˇ; liao3 ru2 zhi3 zhang3]
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