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被盗窃的核材料在黑市上贩卖,这是90年代令人担忧的一个问题。在90年代初期和中期,已报道的非法贩卖核材料的许多案件引起了全球对这个问题
The sale of stolen nuclear material on the black market was a cause for concern in the 1990s. In the early and mid-1990s, many of the reported cases of the illicit trafficking of nuclear material caused widespread concern about the problem