You can declare and initialize a test variable, set its scope, and change its value.
您可以声明并初始化一个测试变量，设置它的范围，并更改它的值。
Set the variable scope to limit variables to live only within a "session".
还要设置变量作用域，以限制变量只在某个“会话”中活动。
Figure 7 and Figure 9 show two options for setting a variable scope.
图7及图9显示了设置变量范围的两个选项。
It can't normally change the value of a variable from outside that scope.
它通常不能更改中的某个变量，该范围之外的值。
It can't normally change the value of a variable from outside that scope.
它通常不能更改中的某个变量，该范围之外的值。
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