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1949年12月,毛泽东主席出访苏联,参加斯大林70寿辰的庆祝活动,并就中苏两党两国共同关心的问题交换意见,商谈和签
In December 1949, Chairman Mao Zedong paid a visit to the Soviet Union to attend the celebrations of the 70th birthday of Stalin and exchanged opinions, discussed and signed the issues of common interest between the two parties of China and the Soviet Union