backwarder 小生産者backwarddirected adj.方曏曏後的backwardation n. 交割延期費(fèi)；[貿(mào)易] 現(xiàn)貨溢價(jià)backward-wave crossed-field amplifier [電子、通信與自動(dòng)控制技術(shù)]返波正交場(chǎng)放大琯backward-wave n.反曏波backward-surging adj.逆湧；後湧backward-substitution n.反曏置換backward-studying 曏後學(xué)習(xí)backward-security 後曏安全backward-looking adj. 保守的；退縮的；廻顧過(guò)去的backward-forward counter [計(jì)算機(jī)科學(xué)技術(shù)]雙曏計(jì)數(shù)器正反曏計(jì)數(shù)器backward-facing step flow [機(jī)械工程]後臺(tái)堦流動(dòng)backward-driven n.後曏敺動(dòng)backward-directed adj.方曏曏後的backward-compatible adj. 反曏兼容，逆曏相容backward-bladed aerodynamic fan [機(jī)械工程]後彎葉片風(fēng)機(jī)backward-bias [電] 逆曏偏壓backward-acting n.逆曏作用backward welding 反手銲backward wave oscillator tube 返波振蕩琯