为了判断两个堆栈是否是部分匹配，使用基于两个调用堆栈的平均堆栈长度的截止百分数。
To determine whether or not two stacks are a partial match, we use a percentage cut-off based on the average stack length of the two call stacks.
基于堆栈平均长度的截止百分数见下表。
The cut-off percentages based on average call stack length are shown in the following table.
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