铜是一个很好的例子。
Weakness in copper is not a good sign for global growth.
对于全球经济增长而言，铜价疲软并不是一个好兆头。
Copper prices are also likely to stay high because of the lack of good substitutes.
铜价可能维持高位，因为缺乏较好的替代品。
Copper is a good conductor of electricity.
铜是电的良导体。
In addition to copper, there are many other metals which are good conductors.
除了铜，还有很多其它金属都是良导体。
Copper is a good conductor of heat.
铜是热的良导体。
Both copper and silver are good conductors of electricity.
铜和银都是电的良导体。
Copper whose resistance is very low serves as a good conductor.
电阻很低的铜可用作良导体。
Copper nickel, good machinability and bad crack resistance.
镍铜，易加工，但抗裂性较差。
Copper nickel, good machinability and bad crack resistance.
镍铜，易加工，但抗裂性较差。
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