你知道吗，美国可是所有发达国家生产率最高的国家。。。

来源: internuts 于 2010-02-23 21:37:46 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.