long gone

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释义
早就没影了；早就消失了
having ended, died, disappeared, etc., at a distant time in the past

例句
Susan: I heard the alarm.
Lincoln: They were long gone before that thing went off. (Prison Break)
苏珊：我听到警报响了。
林肯：警报响之前他们就已经没影了。（越狱）