当样本点达到一定数目时，计算结果的稳定性好。
While the sample points reach to a certain number, the stability of calculation result is good.
当样本点达到一定数目时，计算结果的稳定性好；
When the number of sample data points is big enough, the calculating result is rather stable;
当样本点达到一定数目时，计算结果的稳定性好；
When the number of sample data points is big enough, the calculating result is rather stable;
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