求翻译：课堂上学生的手机一般都是关闭或打到振动功能上的，但是一旦不注意，有哪位同学没有在课前调整好手机，一旦有电话或信息进来，各种流行的彩铃声都有可能响起来，严重影响正常的课堂纪律。课堂上，有的学生不认真听课，利用手机玩游戏、听音乐、看电影或看网络下载的小说，不仅耽误了自己的学习，而且干扰周围同学的学习，有时还会导致跟老师发生课堂上的冲突，影响了课堂纪律。手机对人有辐射。由于青少年的耳朵和颅骨比成年人更小、更薄，因此，中学生使用手机时，大脑吸收的辐射比成年人要高出50%。手机辐射会对脑部神经造成损害，引起头痛、记忆力减退和睡眠失调。是什么意思？

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In the classroom student's handset all is generally shutting down or projects on in the vibration function, once but doesn't pay attention, which schoolmate has not to adjust the good handset in front of the class, once has the telephone or the information comes in, each kind of popular color ting a

Classroom health and mobile phones are generally off or hit on the vibration function, but if not pay attention, what students do not adjust cell phones before class, once a phone or information comes in, a variety of popular color ring could be sounded, seriously affected the normal classroom disci

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