gnawing

动词 gnaw:

1. bite or chew on with the teeth
   同义词：gnaw
2. become ground down or deteriorate
   同义词：erode, gnaw, gnaw at, eat at, wear away

1. The dog was gnawing a bone.
   那条狗在啃骨头。
2. The dog was gnawing at a bone.
   狗在啃一根骨头。
3. She was gnawing her nails nervously.
   她正在神经质地咬指甲。