Terms for subject Mathematics containing stage

English	Chinese
first stage unit	第一级单位
multi-stage estimation	多阶段估计
multi-stage sample	多级阶段抽样
multi-stage sample	多级阶段样本
multi-stage sampling	整群抽样
multi-stage sampling	多级阶段抽样
multi-stage sampling	多级阶段样本
second- stage unit	第二级单位，次级单位，第二阶段抽样单位
stage division	分级方法
three-stage least squares	三段最小平方法
three-stage rocket	三级火箭
two-stage carrier rocket	二级运载火箭
two-stage least squares	两段最小平方法
two-stage least squares	广义古典线性估计量
two-stage sample	两极抽样，两阶段抽样
two-stage sampling	二段抽样
unit stage sampling	单级抽样，单阶段抽样
unit stage sampling	单式抽样，单一抽样