单词学习：lock 名词/动词
lock
/lɒk/
锁；锁定；固定；一缕头发
Mr. Gu always reminds his students to lock the classroom door after the last class.
顾老师总是提醒他的学生们在最后一节课后锁好教室门。
单词卡片
卡片已就绪
