另一名美国官员称，许多企业此前通过第三国供应商间接采购钪，但中国要求许可证申请人申报最终用户，这使外绕路径受到掣肘。“我们的判断是，中国正有针对性地对半导体行业施加压力。”该官员说。
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Blockchain technology was originally invented in 1991 by two mathematicians, Stuart Haber and W. Scot Stornetta. They first proposed the system to ensure that timestamps could not be tampered with.