因此，要浏览这篇文章重的练习，创建两个用户并将其中一个安排为那些角色的每一个。
Therefore, to work through the exercises in this article, create two users and assign one of them to each of those roles.
其实，这里的目标是要创建一个小型语言，这个语言能够允许用户来输入相对简单的代数表达式，然后这个代码来为它求值并产生结果。
In essence, the goal here is to create a small language that allows users to type in relatively simple algebraic expressions that this code will evaluate and produce a result.
要运行完成的测试，您需要为测试创建一个测试调度和一个用户组。
To run the completed test, you need to create a schedule and a user group for the test.
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