高中英語作文：Blackboard黑板

　　Anyone who has ever been to school would have seen many blackboards big and small on which characters in different colors of chalk are written.The blackboard is a kind of cultural tool. It is usually made of wooden boards four to five centimetres thick in the shape of a rectangle.It is painted black on the surface with black paint. Underneath there is a groove for dust.With the development of the educationaI cause, there has been an increasing development in cultural facilities and equipment.The variety of blackboards is on the rise. There are glass-made blackboards, velvet blackboards made on the basis of the function of statics, magnetic black-boards made according to the function of magnetics, etc.

　　任何到過學校的人，總見過許多大大小小的，上面寫著各種顏色粉筆字的黑板。黑板是一種常見的文化工具，它一般呈矩形，用本質夾板做成，厚四五厘米。它的正面涂上黑漆，下面還有一條積灰槽。教育事業(yè)的發(fā)展，促進了文化用品的發(fā)展。黑板的品種不斷增多，有玻璃黑板，有根據(jù)靜電作用造出的絨布黑板，有根據(jù)磁性作用造成的磁性黑板……