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New blackboards have been fitted up in all the classrooms.

教室里都安装上了新黑板.

《简明英汉词典》

How many blackboards are there in this room?

在这个房间里有几块黑板?

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Some cleaned the blackboards, others mopped the floor.

有些人擦黑板, 有些人拖地板.

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In early times, teachers often use the traditional aids, which mainly include blackboards, models and charts.

在早期, 教师一般使用传统教具, 其中主要包括黑板, 模型和图画(图片)等.

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