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大小写变形:Blackboards
New blackboards have been fitted up in all the classrooms.
教室里都安装上了新黑板.
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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.
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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