piecemeal sample逐: pursue; chase; run after段: section; segment; part; para ...抽样: sample; sampling; specimen; ...多段抽样: multistage samplingg; multi??stage sampling多阶段抽样: multi-stage sampling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:逐段抽样,即可在微信中查询翻译