自人类发现煤炭、石油后,20世纪中期又出现了核反应堆,这一具有划时代意义的事件,使人类从此进入了核能时代。1942年12月2日,美籍意大利物理学家E·费米(1901—1954)在美国芝加哥城建成了世界上第一个核反应堆。图1为1967年意大利发行的邮票——E·费米及其建造的核反应堆。图2为2001年美国为纪念E·费米诞生100周年发行的邮票。美国利用并发展了这一科技成果,于1954年9月30日, Since the discovery of coal and oil by mankind, nuclear reactors have emerged again in the mid-20th century. This epoch-making event has led mankind to enter the era of nuclear power. On December 2, 1942, the U.S.-based Italian physicist E. Fermi (1901-1954) built the world’s first nuclear reactor in the United States in Chicago. Figure 1 shows the stamp issued by Italy in 1967 - E. Fermi and the nuclear reactor he built. Figure 2 shows the stamps issued by the United States in 2001 to commemorate the 100th anniversary of the birth of E. Fermi. The United States has utilized and developed this scientific and technological achievement. On September 30, 1954,