vt.

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

   老鼠咬过乳酪。

2. 消耗；腐蚀；侵蚀[（+away）]
   Waves gnawed the sandy beach.

   海浪侵蚀沙滩。

3. 使烦恼；折磨

vi.

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

   兔子在啮咬篱笆。

2. 消耗；侵蚀[（+at/into）]
3. 烦恼；折磨[（+at）]
   Anxiety gnawed at his heart.

   他忧心如焚。

v.

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