The most difficult costs to avoid are those for certification study books and exam fees.

很难避免的一项开销就是认证书籍和考试费用。

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Then, my publisher [McGraw-Hill] asked me to write a certification study guide for DB2 7.

然后，我的出版商[mcgraw - Hill]要求我编写一本DB 2 7的认证研究指南。

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Each worker must transition to a part-time job when they quit their certification study.

每个工作者在放弃学习一个认证之前，必须假设先有一份兼职工作。

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