Shanghai No. 8 Middle School began to use a new bell this term. It helps teachers （记起） it is break time. The new bell has three parts. The （第一） part lasts 15 seconds. It is made up of （可爱的） folk music. Next, there are 20 seconds of silence. The final 25-second bell is a fast-paced march(快节奏进行曲)that seems to tell each teacher, "You have to end class now."

    All the students welcome the new bell. Chen Yong, a student, said, "We tried many ways to stop teachers before, but （没有什么）worked. It's （更好）now. When the folk music is on, teachers know that class is going to be （结束）in one minute."

    Shen Huimin, a teacher at No. 8 （赞成） that the new bell is (创造性的). "In the past, we usually wanted to add a few words after class. But we often （忘记） the time," Shen said. "But now the new bell reminds（提醒） us (两次). It's a small change, but it's really solving a big problem."