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全球每年钪产量仅为几十吨，但它在燃料电池、特种铝合金以及先进芯片工艺和封装环节中承担关键角色。
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"Using firm contracts in uncertain situations carries significant commercial risks," says Albert Sanchez-Graells, a professor at the University of Bristol Law School who has been researching NHS contracts for more than 15 years.