Our class was studying the Gold Rush, something all California fourth graders learned.
我们班正在学习淘金热，加州所有四年级学生都学过这部分内容。
As an asset class, gold is unique.
作为一个资产类别，黄金是独一无二的。
He carried off the first - class gold medal for painting.
他荣获绘画一等金质奖章。
He carried off the first - class gold medal for painting.
他荣获绘画一等金质奖章。
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