sampling scheme with replacement有: 5年 fifteen years返回: return; go back; revert; rec ...抽样: sample; sampling; specimen; ...方案: scheme; plan; programme; pro ...不放回抽样方式: sampling scheme without replacement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:有返回抽样方案，即可在微信中查询翻译
