plastic metal

例句：

1. 1.The new car has a plastic exterior.
   这辆新车有一个塑料外壳。
2. 2. The plastic bag is too heavy to carry.
   这个塑料袋太重了，拿不动。
3. 3. The plastic bottle is easy to break.
   这个塑料瓶很容易摔碎。
4. 1.Copper is a common metal used in electrical wiring.
   铜是一种常用的导电金属，用于电线。
5. 2.The steel beam supports the roof of the building.
   钢梁支撑着大楼的屋顶。
6. 3.Alloys are mixtures of two or more metals.
   合金是两种或更多金属的混合物。