就像物理测试实验室内普通的计算机，虚拟机可以供个人在工作时使用，并在下班时分配用于夜间的回归测试。
Just like ordinary computers in a physical test lab, virtual machines might be used by individuals during work hours and assigned to nightly regression tests during off hours.
有人选择了书籍，有人选择了回归自然，也有人选择了虚拟的网络。
Some people chose the books, some people chose to return to nature, some people choose a virtual network.
将虚拟变量引入修正模型，再次进行回归检验。
The Application of Dummy Variables to the Linear Regression Model;
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