A blackboard is a smooth, flat surface, usually black or dark green, that is used for writing or drawing with chalk. It is commonly found in classrooms and other learning spaces, where it helps teachers or presenters share information with a group of people. The surface of the blackboard allows the chalk to be easily erased, making it possible to reuse the board many times. Blackboards are often mounted on a wall or supported by a stand, making them easy to see from a distance.

“blackboard”的英语定义和含义

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