Cluster sampling, in which random "clusters" of households are measured, is used in populations that are not in even or structured Settings but are spread unevenly over a large geographic area.
分组抽样，即测量随机的家庭“组”，一般用于不均匀地分散在较大面积地理区域的人群。
Food production has doubled in the past 35 years, and there is more food per person than ever before, even if it was unevenly distributed, he said.
他说，在过去35年中，粮食产量翻了一番，即使分配不均，人均粮食占有量也比以往任何时候都多。
Food production has doubled in the past 35 years, and there is more food per person than ever before, even if it was unevenly distributed, he said.
他说，在过去35年中，粮食产量翻了一番，即使分配不均，人均粮食占有量也比以往任何时候都多。
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