1. Josef Stalin was the leader of the Soviet Union from the mid-1920s until his death in 1953.
约瑟夫·斯大林从1920年代中期一直担任苏联领导人，直至1953年去世。
2. Stalin played a major role in the defeat of Nazi Germany during World War II.
斯大林在第二次世界大战中对击败纳粹德国起到了重要的作用。