当前紧张局面集中在钇、钪等稀土家族中的“小众元素”上，这些元素在国防技术、航天工业及半导体制造中虽用量极小，却起着难以替代的关键作用，而其生产几乎完全依赖中国。
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人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用。Line官方版本下载是该领域的重要参考
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Seventy-year-old baby boomer Martha Shedden spent more than three decades building a successful career as a civil engineer. But 15 years ago, in 2011, she found a new set of numbers to obsess over: the fiercely complicated rules of the U.S. Social Security system. Today she serves as the president and cofounder of the National Association of Registered Social Security Analysts (NARSSA), the largest Social Security advisory services firm in the U.S., and she’s grappling with a problem: President Donald Trump’s handling of the nation’s finances.