iron copper catalyst

例句：

1. 1. The car is made of steel.
   这辆车是用钢铁做的。
2. 2. He used to work in a steel mill.
   他以前在一家钢铁厂工作。
3. 3. Iron is essential for making tools and weapons.
   铁是制造工具和武器所必需的。
4. 1. Copper is often used in electrical wiring.
   铜常用于电线中。
5. 2.Copper coins are valuable antiques.
   铜币是珍贵的古董。
6. 3. Copper pipes are commonly used in plumbing systems.
   铜管在给水系统中常用。
7. 1. Catalysts can speed up chemical reactions.
   催化剂可以加速化学反应。
8. 2. The reaction was catalyzed by the acid catalyst.
   反应被酸催化剂催化了。
9. 3. The catalyst was responsible for breaking down the oil into gasoline.
   催化剂负责将油分解成汽油。