党的工人阶级先锋队性质是党的本质和生命。党的建设包括许多内容,其中最根本的问题,是坚持党的工人阶级先锋队性质的问题。它贯穿于党的存在和发展的全过程,决定和影响着党的建设的各个方面。国际社会主义事业遭受严重挫折的历史教训表明, The nature of the party’s vanguard of the working class is the essence and life of the party. The building of the party includes many contents. The most fundamental issue is the question of insisting on the nature of the party’s vanguard of the working class. It runs through the entire process of the existence and development of the party and determines and affects all aspects of party building. The historical lesson of the serious setback in the cause of international socialism shows that,