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1. Gold and silver are precious metals, but ruthenium is the most valuable of them all.
黄金和白银是贵金属，但钌是最有价值的。
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2. The gold standard was abolished in 1971, but it still holds great significance today.
1971年废除了金本位制，但它今天仍然具有重要意义。
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3. The gold mine has been discovered, and its rich reserves are expected to boost the country's economy.
金矿已被发现，其丰富的储量预计将推动该国经济的增长。