The entire universe of things that could be tested is typically too large to be covered within a given schedule, even more when multiple features are combined and the permutation grows exponentially.

可以进行测试的整个范围通常太大，难以在给定的时间内完成测试工作，当多个特性组合在一起时测试的范围将变得更大，其排列组合呈指数上升。

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Create a schedule for test execution which will run multiple iterations of the test.

为将要运行多个测试迭代的测试执行创建调度。

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For example, the Electronic program Guide, which describes the TV program schedule, is a service which is often requested multiple times each day by each user.

例如，电子节目指南用于描述电视节目表，通常每个用户每天将多次请求此服务。

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