copper sheet的用法和樣例：
例句
- A protective copper strip was hammered onto the end of the post.
桿梢釘上銅皮起保護作用。 - He was hammering the sheet of copper flat.
他正把銅片錘平。 - Copper plates are imported from Japan,pure silver ingots for plating from Switzerland,and argentic salt and other chemicals from Germany.
採用日本進口的銅片，鍍銀用的瑞士純銀條，西德的銀監及化工原料等等。
