单词学习：fret 动词/名词
fret
/fret/
1. (v.) 烦恼，发愁；磨损，侵蚀 2. (n.) (弦乐器指板上的)品；烦躁
Mr. Gu advised his students not to fret over small mistakes in their homework.
顾老师建议他的学生不要为作业中的小错误而烦恼。
单词卡片
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