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twostage | sampling method
 sampling method abbr.
anim.husb. 取样法; 采样本法
desert. 采样法; 取样方法
ecol. 采样方法
qual.cont. 抽样法
tech. 抽样方法; 抽样调查法

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twostage
: 6 phrases in 5 subjects
Business1
Chemistry2
Oil / petroleum1
Rail transport1
Space1

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