backbarn.支承梁；托梁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backroom politics.幕后政治back eccentric wheel倒行偏心轮Backless wall-unit不设背板的壁橱Back-EMF detection反电势检测back pressure effect[医] 反压效应back turning of head鸱视back and face effect正背效应backscattering gauge反向散射测量计backswamp depression漫滩洼地backpressure turbine背压式汽轮机

1. When the animals were roused, there was a paroxysmal cough with the back arched.
   动物们惊起时，则有发作性咳嗽和拱背。
2. Thereafter, slow and expiratory, at the same time arch back carries genu hits the specified number with genu.
   尔后，缓慢呼气，同时拱背抬膝以膝触额。