disappear (or go off, vanish, etc.) into the blue

突然失蹤、消失；消失得無影無蹤。

例句：

• When the girl saw her mother all her sadness disappeared into the blue. (這女孩一見到她媽媽，她的悲傷便煙消雲散了)
• The bank robber ran so fast that he went off into the blue. (銀行搶匪跑得很快，一下子就消失得無影無蹤)

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