system of collective security是什么意思 system of collective security怎么读
system of collective security的相关资料
system of collective security的用法和样例
- The political battle over President Bush's plan to revamp the U. S. government pension system known as Social Security is expected to intensify over the next few weeks.
有关布什总统提出的修改政府退休制度，也就是社会安全制度的政治斗争，预期在未来几个星期将会更加激烈。
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