lehr belt

例句：

1. 1. She always carries a lehr belt when she goes to the library.
   她去图书馆时总是带着一条教学带。
2. 2.He bought a new lehr belt for his son's upcoming exams.
   他为儿子即将到来的考试买了一条新的教学带。
3. 3. The teacher used the lehr belt to explain the difficult concepts in class.
   老师用教学带来解释课堂上的难懂概念。