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When students got their textbooks at the beginning of the year at San Mateo High School, they also received the Yondr pouch, a locking device for their phones. 当圣马特奥高中的学生在年初拿到课本的时候，他们也收到一个用来锁住手机的Yondr袋子。 The phone slides into it and gets locked through a magnetic device. It's not unlocked again until the final bell rings. The procedure will repeat every day for the rest of the school year. 手机划入袋中，然后就被一个有磁力的装置锁住了。直到放学铃响后，这个装置才会解锁。该程序在本学年之后的每一天都会重复进行。 Adam Gelb, the assistant principal ran a pilot project last year with 20 students and decided to do a school-wide, bell to bell program for this school year. 这个学校的副校长亚当·格尔布去年与20名学生试验了这个项目，他决定在本学年在全校实行铃声项目。 | 
