a gnawing animal的用法和样例：
- There was a gnawing pain from the wound.
- He was afflicted always with a gnawing restlessness.
- He stalked away, but with a gnawing uncertainty in his breast.
- But he was also hungry, with a gnawing, unwholesome kind of hunger.
- From the ground had risen a gnawing frost that chilled him to the bone.