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前苏联曾经发生过两起重大核事故,一起是1986年举世震惊的切尔诺贝利核事故;另一起是在此之前,秘而未宣,鲜为人知的乌拉尔核惨案。
Two major nuclear accidents have taken place in the former Soviet Union, together with the world-famous Chernobyl nuclear accident that stunned the world in 1986; the other was the secret Ustall nuclear tragedy that was previously unknown.