单词学习：gnaw 动词
gnaw
/nɔː/
咬，啃；侵蚀；使烦恼
The sound of a mouse gnawing on wood kept Mr. Gu awake all night.
老鼠啃木头的声音让顾老师整夜未眠。
单词卡片
卡片已就绪
