silver bullion的用法和樣例：
例句
- People began to "deposit" coins, as well as gold or silver bullion, into institutions for safekeeping.
于是人們出于安全考慮開(kāi)始把金幣和金條銀條存在某個(gè)機構里。 - Copper plates are imported from Japan,pure silver ingots for plating from Switzerland,and argentic salt and other chemicals from Germany.
采用日本進(jìn)口的銅片，鍍銀用的瑞士純銀條，西德的銀監及化工原料等等。
