高中英语语法-英语说明文的写作方法（二）_高考语法

高中英语语法-英语说明文的写作方法（二）

　　　　Coal underwent（经受）many changes before it became the bright，brittle（脆的），black substance which we now use. During ancient times（在上古时代），when the earth enjoyed a very warm and wet climate，the land was covered with large forests and big plants. As time went on，the ground changed and began to sink（下沉）a little. These very large numbers of trees and vegetables received a deposit（沉淀）of sand and clay. This layer of sand and clay pressed upon the layer beneath and prevented it from contact with air. These trees and plants received the pres sure and changed its appearance.

　　　　Generations after generations（几世纪后），as the ground kept gradually sinking，another layer of sand and clay was again deposited（积聚）above the layers already formed. A great pressure was thus exerted（作用）and the peat（泥煤）was changed into the black and brittle substance which is known as coal.

　　　　Coal is a kind of mineral which is formed by nature as above stated. It is an important industrial material and is chiefly used as fuel. It is very valuable in the industrial world. The place where coal deposit is called a coal mine（煤矿）。 In China，coal mines are largely found in the north-west part of the country. Shanxi is a famous province for producing coal. It has the most coal of China.