今日短语
keep an eye on someone 监视；注意；留意
例句
The private school has found a new way to keep students under control. It installed cameras in its classrooms which allow parents to keep an eye on their children via the Internet.
那家私立学校已经发现管理学生的新方法。它在教室装摄影机，让家长透过网络监视他们的小孩。