让我们做一些替换练习。

Let's do some substitution drills.

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两次练习测验中,都有一道题是关于变量替换的,感觉这是很重要的那样。

There is one change of variable problem on each of the two practice exams to give you a feeling for what's realistic.

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在练习中，由于我们只有一个资源管理器，因而将icmnlsdb替换为rmdb，为资源管理器执行联机备份。

In this exercise setup, since we only have one Resource Manager, replace icmnlsdb with RMDB to perform online backup for Resource Manager database.

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