gnaw
单词辨析：
普通用词，强调用牙咬住、咬掉、把东西咬碎。
The dog bit that boy and made his leg bleed.
狗把那个小男孩的腿咬出血了。
He was bitten by a snake.
他被蛇咬伤了。
指嚼或吃食物时发出较大声响。
There he sat, happily champing his lunch.
他坐在那里，津津有味地吃着午餐。
The horses were champing their hay.
马在咔嚓咔嚓地咀嚼干草。
通常只用于 gnash your teeth 这一习语中，表示因愤怒或痛苦而咬牙切齿。
Seeing his enemy, he gnashed his teeth.
见到仇人，他把牙齿咬得格格作响。
指用力咬或啃一件东西，含有连续不断的意思。
The rats gnawed a hole in the box.
老鼠把箱子咬了一个洞。
The dog is gnawing on a bone.
狗在啃骨头。
相关例句：
Even the person, also can gnaw by them leaving bones of the dead.
就是人，也会被它们啃成一堆白骨。
Bad debts are continuing to gnaw at the bank's profits.
坏帐不断地减少银行的利润。
Doubts were already gnawing away at the back of his mind
心底的疑团已经开始困扰他。
Woodlice attack living plants and gnaw at the stems
木虱会侵害活体植物并啃咬它们的茎。
The left smells a multinational rat that would gnaw at US labour and environmental standards.
其中的左翼闻到了一只会啃食美国劳工及环保标准的跨国老鼠的气味。
A rat can gnaw a hole through wood.
老鼠能啃穿木头。