名词
中文翻译：Unknown
同义词：
['precious metal', 'valuable metal', 'precious metals', 'valuable metals']
例句：
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1. The noble metal is used in jewelry and electronics.
这种贵金属用于珠宝和电子产品。
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2. The precious metal was mined from the earth for centuries.
这种贵重金属从地球中开采了数百年。
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3. The valuable metal has a high market demand.
这种贵重金属市场需求量大。