platinum series metals 铂系元素
activity series of metals 金属活泼性次序
metals series
金属系列
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But it occurs to me that one of the effects of the adoption of thorium technology would be to make a series of other metals, like tantalum and the rare earths, rather cheaper.
FORBES: An Odd Thought: Thorium Reactors Would Make Tantalum And Rare Earths Cheaper
In 2009 Rio Tinto, an Anglo-Australian mining firm, withdrew from a deal to sell a series of minority stakes to Chinalco, a Chinese metals firm.
ECONOMIST: What it feels like to be bought by a Chinese firm
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