來無影，去無蹤

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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來無影，去無蹤|来无影，去无踪 [lái wú yǐng , qù wú zōng] ► lit. come without a shadow, leave without a footprint (idiom); to come and go without a trace