苏维埃制度

例句：

1. 1. The Soviet Union was a socialist state that existed from 1922 to 1991.
   苏联是一个社会主义国家，从1922年到1991年存在。
2. 2. The Soviet Union is known for its centralized government and strict censorship.
   苏联以其集中的政府和严格的审查而闻名。
3. 3. The Soviet Union was the first country to implement a comprehensive social welfare system.
   苏联是第一个实施全面社会福利制度的国家。