The collapse of the Soviet Union and the breakup of Yugoslavia in the nineteen nineties challenged NATO's traditional position as a defensive alliance. 苏联的解体和南斯拉夫一九九零年的解散改变了北约作为一个防御联盟的传统位置。
China is only the third country in history to put people into space with its own rockets, following the former U.S.S.R. and the U. 中国是继前苏联和美国之后有史以来第三个利用自造火箭将航天员送入太空的国家。