nonstratified sample非分: overstepping one's bounds; a ...层: I storey; tier; stratum样本: sample book; specimen; advan ...分层样本: stratified sample定位分层样带: permanent layer transect下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:非分层样本，即可在微信中查询翻译
