您要查找的是不是：
- The chemical symbol for copper is "Cu". 铜的化学符号是Cu。
- What color is copper sulphate solution? 硫酸铜溶液是什么颜色？
- Copper and gold are both metals. 铜和金都是金属。
- Copper has less resistance than lead. 铜的电阻比铅的小。
- The office has been humming with activity. 办公室一直忙着搞活动。
- What color is copper sulfate solution? 硫酸铜溶液是什么颜色？
- The threat of war has depressed business activity. 战争的威胁使经济萧条。
- A copper coin formerly used in India and Pakistan. 安那旧时在印度和巴基斯坦使用的铜币
- There has been a lot of activity in the town today. 今天市中心相当热闹。
- Ornamental copper pans hung on the wall. 墙上挂着装饰性的铜盘。
- The town was humming with activity. 该市镇生气勃勃，呈现一片热闹的景象。
- This mountain road leads to the copper mine. 这条山路通向那个铜矿。
- Brass is an alloy of copper and zinc. 黄铜是铜和锌的合金。
- We fuse copper and tin to make bronze. 我们把铜和锡熔制成青铜。
- They will mine copper there in the valley. 他们将在那边的山谷开采铜矿。
- Stamp collecting is my favorite activity. 集邮是我最喜爱的消遣。
- Brass is formed by the fusion of copper and zinc. 黄铜是由铜和锌熔合制成的。
- The store was a scene of great activity. 这家商店顾客盈门。
- Copper conducts electricity better than iron does. 铜的导电性比铁强。
- He once engaged in anti-government activity. 他一度从事反政府的活动。
