在我国进行全国性的抽样调查,一般来说研究总体(调查总体)只有一个,即是“中国”范围所涵盖的对象。但是在实践中,我们经常将这一总体分为城乡两部分,一是城市样本,一是农村样本。这样做更大程度上是出于中国城乡二元社会结构的 In China, a nationwide sample survey is conducted. Generally speaking, there is only one research population (survey population) in general, which is covered by the scope of “China”. However, in practice, we often divide this overall into two parts: one is urban sample and the other is rural sample. This is largely due to the dual urban-rural social structure in China