第二次世界大战结束后,在美国和加拿大都发现了丰富的铀矿床。北美和南非的铀矿资源,在五十年代曾保证了资本主义国家扩军备战的需要。因此,55—58年间,北美的铀矿勘探工作曾有过停顿。到了六十年 After the Second World War, abundant uranium deposits were found in the United States and Canada. The uranium resources in North America and South Africa guaranteed the capitalist countries the need for arms expansion and preparation in the 1950s. As a result, uranium exploration work in North America had been halted in 55-58 years. To six years