New words：

monitor [ˈmɒnitə(r)]
v.监控；监视；监听；检查
n.班长；监测仪；屏幕；显示屏

Sample Sentences：

A monitor is a basic output device.
Your doctor will monitor your blood pressure.
The monitor plays an important role in our class.
The details of today's flights are displayed on the monitor.

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