网络和数据库访问的开销非常大，因此，如果吞吐量极为重要，则这可能无法满足您的需要。
Network and database access is costly and thus, this may not meet your needs if throughput is of Paramount importance.
它分成了几类，例如，J2EE 开发、安全性和迁移，因此您可以专心学习对您最为重要的主题。
It's divided into categories like J2EE development, security, and migration, so you can zero in on the topics of most interest to you.
更为重要的是，如果您现在也考虑这个如何生存的问题，那么一旦有需要的时候您就会对改变方向做好万全的准备。
What's more, if you think about how to survive now, you'll be well prepared to change direction if the need arises.
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