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努力提高列车重量是国内外铁路共同发展方向,自50年代初到80年代初的三十年中,苏联提高94%,美国提高45%,印度提高59.5%,我国提高84%,我局提高78.1%。怎样才能快
Efforts to improve train weight are the common development direction of railways both at home and abroad. In the three decades from the early 1950s to the early 1980s, the Soviet Union increased by 94%, the United States by 45%, India by 59.5%, China by 84% and our bureau by 78.1 %. How fast