如果学生没有使用手机，手镯的屏幕上会有张照片显示出来。
If the students did not use their cell phones, there would be a photo on the screen of the bracelet to show that.
老师和家长都同意限制学生使用手机。
Both the teacher and the parent are in agreement on limiting students' phone use.
限制学生使用手机在一些国家已经是很普遍的做法。
It's already common practice in some countries to limit students' use of mobile phones.
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