來無影，去無蹤 [ㄌㄞˊ ㄨˊ ㄧㄥˇ , ㄑㄩˋ ㄨˊ ㄗㄨㄥ; lai2 wu2 ying3 , qu4 wu2 zong1] lit. come without a shadow, leave without a footprint (idiom); to come and go without a trace ◄ ►
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