铜片

Copper plates are imported from Japan,pure silver ingots for plating from Switzerland,and argentic salt and other chemicals from Germany.

采用日本进口的铜片，镀银用的瑞士纯银条，西德的银监及化工原料等等。

That achievement came at the Bevatron accelerator at Lawrence Berkeley National Laboratory, by smashing protons into a piece of copper.

劳伦斯柏克莱家实验室的贝加速器（Bevatronaccelerator）里，质子撞击铜片便可到。