"tennis has had to take a backseat while his work is so demanding"
backwayn.后退距离
backn.后面;背脊;靠背;后背;后卫vt.支持;后退adv.向后地adj.向后的;后面的;偏远的;过时的;积欠的
back-up circuit[计] 备用电路
backmixed reactor返混式反应器
backfilling earth回填土
back vertex power后顶屈光度
backfill grouting回填灌浆
back-hoe bucket反铲斗
back-up control备用控制
backplane routing底板走线
backing side trap前级侧阱
backtrack parsing回溯剖析