vt.

1. 咬，啃，嚙；咬斷；咬成[（+off/away）]
   The mouse gnawed the cheese.

   老鼠咬過乳酪。

2. 消耗；腐蝕；侵蝕[（+away）]
   Waves gnawed the sandy beach.

   海浪侵蝕沙灘。

3. 使煩惱，折磨

vi.

1. 啃，嚙[（+at/into/on）]
   The rabbits are gnawing at the fence.

   兔子在嚙咬籬笆。

2. 消耗；侵蝕[（+at/into）]
3. 煩惱，折磨[（+at）]
   Anxiety gnawed at his heart.

   他憂心如焚。

v.

1. bite at or nibble persistently.
2. [often as adj. gnawing] cause persistent anxiety or distress.