What is the most useful metal? 最有用的金属是哪个？

　　Copper is one of the most useful metals in people's lives. 铜是人们生活中最有用的一种金属。

　　Copper is found everywhere. 铜无处不在。

　　It delivers electricity very quickly, so every wire is made of copper. 它能非常快速地传导电流，因此电线都是由铜制成的。

　　Bullets, irons, electric stoves and pots also contain copper. 子弹、铁、电炉和罐子里都含铜。

　　Copper is not as expensive as silver or gold. 铜不像银或金那样昂贵。

　　People make cheap accessories using copper. 人们用铜来制作廉价的饰品。

　　Because it has a beautiful color. 因为铜有美丽的颜色。

　　Copper is sometimes used to cover the surface of buildings. 所以有时会把它镀在建筑物的表面。

　　Do you know that copper is the first metal people used in history? 你知道铜是人类历史上使用的第一种金属吗？