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cluster sampling
adv.	巢式抽样法
busin.	分组抽样法
math.	整群抽样
oil	分组取样; 密集取样
qual.cont.	区域抽样法; 集中采样
space	整群随机抽样 (法)
stat.	群集抽样法; 分群抽样法; 成团抽样
tech.	属性取样; 丛块取样; 密集样本; 整群取样; 成群取样; 成群抽样; 成串采样; 分组抽样; 群组抽样; 群体抽样

cluster sampling: 15 phrases in 4 subjects

Business	2
Mathematics	1
Statistics	7
Technology	5