我一个朋友说他一路追我进了一个死胡同，可是我就无影无踪地消失了。
One of my friends said he chased me all the way into a dead-end alley, and that I would just disappear without a trace.
我叫她小心点，不然她就要跌下去，她很灵敏地无影无踪。
I bid her be cautious lest she got a fall, and she nimbly disappeared.
最后，飞机神秘地消失得无影无踪了。
Finally and mysteriously, the plane disappeared without trace.
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