Making assumptions about individuals from group data is generally only reasonably safe when the variation within the group is small.
只有当一组数据内部变化程度相对较小时，据此做出的对个体的判断才会比较可靠。
Making assumptions about individuals from group data is generally only reasonably safe when the variation within the group is small.
只有当一组数据内部变化程度相对较小时，据此做出的对个体的判断才会比较可靠。
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