中国教育部宣布，学校应该禁止学生在上课时间携带手机。

The Education Department of China has announced that schools should ban students from carrying mobile phones during school hours.

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老师宣布要到校外上课后，教室里洋溢着兴奋之情。

After the teacher announced the field trip, the classroom was alive with excitement.

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四年级的老师杜能卫将教鞭轻轻拍打了一下桌子，宣布了上课开始，珊珊和她的同学们便整齐的起立。

The students in Shan's fourth grade class rose in unison as the teacher, Du Nengwei, tapped his pointer against his desk to start the lesson.

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他站在我们的面前，宣布开始上课。

He stood in front of us, announcing that class began.

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已经宣布今天下午不上课。

It is declared that there will be no school this afternoon.

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一次，学生们正在机房上课，总电源突然跳闸，重新合闸之后，一个教室竟有大约三分之一的计算机以这种方式宣布罢工。

First, the students are the engine room school, with a total power trip suddenly, after re-closing of a classroom, there were about one-third of the computer to declare a strike in this way.

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一次，学生们正在机房上课，总电源突然跳闸，重新合闸之后，一个教室竟有大约三分之一的计算机以这种方式宣布罢工。

First, the students are the engine room school, with a total power trip suddenly, after re-closing of a classroom, there were about one-third of the computer to declare a strike in this way.

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