1. certified milk; certified check; certified mail. 
   合格牛奶；保付支票；保证邮件。
2. [11] Bush has participated in more traditional PE classes, where a classroom teacher, rather than a certified physical education instructor, released a stream of children onto the playground with a soccer ball and one barked command. "Go!" 
   [11]布什参加过一些更传统的体育课----上课时，任课老师，而不是持证体育教员，拿着一只英式足球，随着一声吼叫“走！”把一群孩子放进运动场。
3. certified grade AAA meat. 
   担保是质量一流的肉。
4. What is certified letter? 
   什么是挂号信？
5. That means an upgrade for users still plugging a way with NetWare 3.X and early NetWare 4 versions. 
   这意味着用户的升级仍将是在netware3.x和早期的netware4.0版本加入一种解决2000年问题的方法。

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