没有痕迹的；无痕的
无法追踪的；难以查明的；无法追踪的；不可追踪的；无痕迹的；没留痕迹的；[法] 无踪迹的
having no traces
没有痕迹的。
That has no traces
无法追踪的；不可追踪的
That cannot be traced; untraceable
The teacher wiped the whiteboard until it was traceless.
老师一直擦白板，直到它毫无痕迹。
用法提示：traceless 作表语，表示“没有痕迹的”。
The hiker's traceless disappearance in the forest worried everyone.
徒步者在森林里毫无踪迹的失踪让大家都很担心。
用法提示：traceless 作前置定语，修饰 disappearance，表示“没有留下踪迹的”。
This magic eraser makes the dirty wall traceless in seconds.
这款魔力擦几秒钟就能让脏墙变得毫无痕迹。
用法提示：traceless 作宾语补足语，表示“使……无痕”。
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