单词学习：gap 名词
gap
/ɡæp/
缺口；间隙；差距；隔阂
There is a significant gap in understanding between the students, so Mr. Gu patiently explains the concept again.
学生们的理解存在显著差距，所以顾老师耐心地重新解释了这个概念。
单词卡片
卡片已就绪
