详细解释:苏维埃社会主义共和国联盟, 苏联
英语解释：
名词 union of soviet socialist republics:
a former communist country in eastern Europe and northern Asia; established in 1922; included Russia and 14 other soviet socialist republics (Ukraine and Byelorussia and others); officially dissolved 31 December 1991同义词：Soviet Union, Russia, USSR