问题: 大师，求助！
采用４阶段分层整群随机抽样的方法，在每个调查市（县）抽3个街道（乡镇），每街道（乡镇）抽2个居委会（村），每居委会（村）抽90户
解答:
Adopting 4-layer sampling technique to pick on random basis 3 streets (or townships) from each investigating city (or county). From each of the 3 streets (or townships) picked, 2 District Committees (or villages) to be picked on random. And from each of the 2 District Committes (or villages) picked, 90 households to be selected randomly.
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