Gone for good and never to return; a one-way trip with no possibility of coming back.
这座古老的矿井深不可测，许多下去探险的人都传说有去无回。
This ancient mine is unfathomably deep, and it is rumored that many who have gone down to explore have never returned.
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Gone for good and never to return; a one-way trip with no possibility of coming back.