stratified sampling
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horse-racing,
horseradish,
horse-radish,
horseradish peroxidase,
horseradish sauce,
horserake,
horse-rake,
horses,
horseshit,
horseshoe,
相似单词
straticulate,
straticulation,
stratification,
stratified,
stratified sample,
stratified sampling,
stratiform,
stratiformis,
stratify,
stratigrapher,