| 21. | Copper conducts electricity better than iron does. |
| 铜的导电性比铁强。
|
| 22. | Copper and gold are both metals. |
| 铜和金都是金属。
|
| 23. | Copper welds easily. |
| 铜很容易焊接。
|
| 24. | a copper tray plated with silver |
| 镀银的铜托盘
|
| 25. | the chemistry of copper |
| 铜的化学组成, 性质和反应
|
| 26. | the mining of copper in central Africa |
| 中部非洲的铜矿开采业
|
| 27. | the fusion of copper and zinc to produce brass |
| 将铜和锌熔合以制造黄铜
|
| 28. | a table covered with a copper overlay |
| 包铜桌子
|
| 29. | two metres of copper , plastic, etc tubing |
| 两米铜管, 塑料管等
|
| 30. | blue vitriol,ie copper sulphate |
| 胆矾(五水硫酸铜)
|