nail-biting

n.

咬指甲癖性，束手无策；

Nailbiting.
Nailbiting.
Nailbiting
A double-blind comparison of clomipramine and desipramine treatment of severe onychophagia (nail biting)
Clinical trials. Nail-biting time for trials of COX-2 drugs.
Eliminating nail-biting by the habit reversal procedure
Genetic and environmental influences on finger-sucking and nail-biting in Japanese twin children
System and method for deconditioning habitual nail biting
Nailbiting, or onychophagia: A special habit
Method and device for inhibiting nail biting
Pathologic hairpulling, skin picking, and nail biting
Analyzing a nail-biting election
Habit reversal vs. negative practice treatment of nailbiting