adj.咬的；痛苦的；折磨人的
动词gnaw的现在分词形式.
I've had gnawing doubts about this project for some time. 这个项目已经困扰我一段时间了。
At night gnawing pain pierces my bones. 夜间痛苦刺透我骨。
From the ground had risen a gnawing frost that chilled him to the bone. 地面上升起一股刺骨的寒气，使他冷彻骨髓。
