It is normal for white gold jewellery to lose brightness over time, but white gold wedding rings can be maintained with rhodium plating every few years or so.
白金珠宝随着时间的流逝失去光泽是很正常的事情，但是你可以通过每隔几年将其重新镀铑来使其保持光泽。
In addition to bias, the manufacturing technique and plating of the barrel itself influences R2 over the lifetime of the contact.
除了偏置以外，壳体本身的制造技术和镀层也会在弹针的整个使用寿命期限内影响R2。
Contact plating: Gold plating over Nickel on contact area tin plating on solder tail.
触点电镀：镀镍金的接触面积的锡焊尾电镀。
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