Export restrictions on critical raw materials have increased fivefold since 2009 despite continuing efforts by advanced economies to diversify their supply chains, OECD research has shown.Analysis of export restrictions on important ingredients for defence, technology and green energy supply chains also found that an increasingly broad range of countries were now imposing controls.
经合组织(OECD)的研究表明，尽管发达manbetx20客户端下载 体持续努力实现供应链多元化，但自2009年以来，关键原材料的出口限制增加了五倍。
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