backdoor operation [電子、通信與自動(dòng)控制技術(shù)]后門交易backdoor (adj.) backdoor adj.秘密的；偷偷摸摸的backdiigger n.反鏟挖土機(jī)；反向鏟backdigger n.反鏟挖土機(jī)backdiffusion n.反行擴(kuò)散；反向擴(kuò)散 背面擴(kuò)散backdeeps n.后淵；海洋深部backdeep n.后淵backdating 追溯backdate (v.) backdate v.回溯；將日期追溯到過去某時(shí)backcycling 反循環(huán)backcross quantitative trait [醫(yī)藥科學(xué)]回交定量性狀backcross hybrid [生物學(xué)]回交雜種backcross cytoplasm [醫(yī)藥科學(xué)]胞質(zhì)回交backcross breeding [農(nóng)業(yè)科學(xué)]回交育種回交轉(zhuǎn)育[生物學(xué)]回交育種backcross v. 使（雜種）回交（或逆代雜交） n. 回交；逆代雜交；回交子代backcrawl n.仰泳; 仰泳比賽backcourtman 后衛(wèi)backcourt n. 距球門最遠(yuǎn)處；端線；后場(chǎng)