background aged writes [經(jīng)濟(jì)學(xué)]后臺(tái)延期寫background activity level [醫(yī)藥科學(xué)]本底放射性水平background activity 后臺(tái)活動(dòng)；本底放射性background acquisition [計(jì)算機(jī)科學(xué)技術(shù)]背景采集background absorption correction 背景吸收校正background absorption 背景吸收background (n.) background n. 背景；隱蔽的位置 vt. 作…的背景 adj. 背景的；發(fā)布背景材料的backgroud vt.向…提供詳細(xì)的背景材料；nbackgearing 背輪backgeared adj.具有后齒輪的(減速的)backgear n.后齒輪(背輪)backgating n.后選通backgammon set [文學(xué)]雙陸backgammon (n.) backgammon n.西洋雙陸棋戲；十五子棋backfurrow n.回犁；閉壟backformation n.逆序造詞，倒反構(gòu)詞backform n.后模；頂模backflushing chromatography [生物學(xué)]反吹層析反沖層析