be secret in one's movement and trace;mysterious movement ;
A motley crew they are, their doings as dark as they are ludicrous ( John Simon )
他们是一群行踪诡秘, 为人荒唐可笑的乌合之众 ( 约翰西蒙 )
He was surreptitious in his movements.
他行踪诡秘.
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