dual-cycle ether extraction process双: two; twin; both; dual循环: circulate; circle; round; re ...乙醚: diethyl ether萃取: extract; extraction法: law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:双循环乙醚萃取法，即可在微信中查询翻译
