程序码剖析执行期间收集的所有专有样本数中，此函式或资料范围的专有样本数所占的百分比。
The percentage of the total number of exclusive samples in the profiling run that are exclusive samples of the function or data range.
类别中的变数栏位与全域或函式变数类似，但它只能在类别范围中作用，而且可以具有控制可视性与用法的不同属性。
A variable field in a class is similar to a global or function variable, except that it is scoped to the class and it can have various attributes governing its visibility and usage.
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