Pennies in particular are rarely pure copper.
一般来说，硬币很少使用纯铜制造的。
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。
Unique ultra pure copper mirror, low reflection, heat loss is small.
特有超纯铜镜面，低反射，热损小。
Pure Copper base material ensures excellent heat dissipation.
纯铜基底确保散热效果。
Pure Copper base material ensures excellent heat dissipation.
纯铜基底确保散热效果。
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