名词
中文翻译：Unknown
同义词：
['Rare earth elements', 'Rare metals', 'Rare earth metals']
例句：
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1. The new car uses a mixture of rare earth metals to improve its performance.
这款新车使用了稀有金属混合物来提高其性能。
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2. The research team focused on the use of rare earth metals in energy storage systems.
研究团队专注于稀有金属在能源存储系统中的使用。
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3. Due to the high cost and limited availability of rare earth metals, their use is often restricted.
由于稀有金属成本高昂且供应有限，它们的使用通常受到限制。