百度 例如，物理学家曾试图把电磁力和弱核力统一起来，但是他们的公式中老是出现无穷大的结果，使得计算无法进行下去。
Children view a tank at a traning center in southwest China's Chongqing Municipality, July 25, 2018. Six hundred children from 18 impoverished townships were invited to participate in a series of activities on the themes of patriotism education and science education. (Xinhua/Tang Yi)
Children view a tank at a traning center in southwest China's Chongqing Municipality, July 25, 2018. Six hundred children from 18 impoverished townships were invited to participate in a series of activities on the themes of patriotism education and science education. (Xinhua/Tang Yi)
