fineness of gold

例句：

1. 1.The jewelry was made from pure gold.
   这件珠宝是由纯金制成的。
2. 2. Gold is often used as a currency in countries with high inflation rates.
   在通货膨胀率高的国家，黄金常被用作货币。
3. 3. The fineness of the gold is measured by its weight and purity.
   黄金的纯度是通过其重量和纯净度来衡量的。