The newsletter is a useful channel of communication between teacher and students.
发简讯是沟通师生的有益渠道。
Schools should not ask students to do homework on the phones and they should set up teacher hot lines and public phones for communication between parents and students.
学校不应要求学生在手机上做作业，他们应该设立教师热线和公共电话以供家长和学生沟通。
The invention relates to a teaching aid for communication between teacher and students: hand-up device.
本发明涉及一种用于师生之间通信的教具：手动装置。
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