subsampling of unequal clusters

例句：

1. 1.The researchers conducted a subsampling of the data to identify patterns.
   研究人员对数据进行了抽样，以识别模式。
2. 2. The company is using subsampling to improve its product line.
   该公司正在使用抽样来改进其产品线。
3. 3.The statistician performed a subsampling of the population to determine the average age.
   统计学家对人群进行了抽样，以确定平均年龄。