This is because data set by one test is not visible to other tests, even if the other test contains a variable with the same name.
这是因为一个测试所设置的数据对其他测试来说是不可见的，就算其他的测试也包含有相同名字的变量也是这样。
You can define a variable in one test to capture and store test data and then reference the test variable in a second test.
您可以在一个测试中定义一个变量，以获取和存储测试数据，然后在第二个测试中引用测试变量。
Otherwise, statisticians say only strict clinical trials with a control group and a test group and one variable can truly prove a cause-and-effect association.
否则，统计学家表示只有进行严格的临床试验，对比一个控制组、一个测试组以及一个变量，才能真正证明因果关系。
Start by recording a simple test with one variable data item, a search string.
通过记录带有一个可变数据的项目和一个搜索字符串的简单测试开始。
Simulation test illustrates that the presented algorithm is efficient for both one-variable functions and multi-variable functions.
实验测试结果表明，该算法对一元函数和多元函数都有很好的效果。
Simulation test illustrates that the presented algorithm is efficient for both one-variable functions and multi-variable functions.
实验测试结果表明，该算法对一元函数和多元函数都有很好的效果。
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