Pennies in particular are rarely pure copper.
一般来说，硬币很少使用纯铜制造的。
Pure Copper base material ensures excellent heat dissipation.
纯铜基底确保散热效果。
Unique ultra pure copper mirror, low reflection, heat loss is small.
特有超纯铜镜面，低反射，热损小。
Made in pure copper, ceramics switch inside, with spray and massage function.
全铜材料，内含陶瓷片开关喷雾、按摩两功能。
It was compared with the pure copper specimens to investigate the wear mechanism.
并与纯铜进行比较，探讨颗粒增强物对材料磨损行为影响的机理。
The material first used was copper for it is easily obtained in its pure state.
最先使用的材料是铜，因为纯属易于炼取。
The uniform was made of pure wool and was yellow with copper buttons.
军上衣也是黄色，纯呢的，铜扣子。
The uniform was made of pure wool and was yellow with copper buttons.
军上衣也是黄色，纯呢的，铜扣子。
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