单词学习：sharpen 动词
sharpen
/ˈʃɑːrpən/
使锋利；使尖锐；使清晰；使增强
Before the art class, Gu Laoshi asked the students to sharpen their pencils carefully.
美术课前，顾老师让学生们仔细地把铅笔削尖。
单词卡片
卡片已就绪
