Their blackboard is the whiteboard so that it can only be written by the whiteboard pen. …The blackboard is white board, can only use white…

他们的黑板是白色的白板，只能用白板笔在上面写字。（翻译一下）

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The company mainly produces roller-tip pens, ball point pens, Gel ink pen white board marker permanent marker, mechanical pencil and other stationeries.

公司主要生产水性笔、中性笔、圆珠笔、白板笔、记号笔、活动铅笔等文化用品。

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