One day he left, disappeared without a trace.

有一天他离开了，消失得无影无踪。

《柯林斯英汉双解大词典》

It disappeared without a trace, like fine red wine in crystal.

牠消失得无影无踪，就好像水晶杯里酡红的红酒。

youdao

The trees disappeared without a trace.

这里原有的树林已经消失得无影无踪。

youdao

She called on Eritrea to clarify the whereabouts of 11 MPs who disappeared without a trace in September,2001.

VOA: standard.2009.04.09

Mel B's Hot could enter the charts no higher than number 28, then disappeared without a trace.

BBC: Emma Bunton

On the contrary, that unemployed army has disappeared without a trace--no doubt temporarily diving into nice, safe corporate careers.

FORBES: A Season For Surprises

MH370 seemingly disappeared without a trace.

CNN: Pilot spots large object off Reunion Island