back bias voltage [電子、通信與自動(dòng)控制技術(shù)]負(fù)偏壓back bias [電子] 反饋偏壓back bend 下腰back benches back bencher back bench back bead 背面焊道（縫）；封底焊道back band [建] 背圈back azimuth 后向角 [水運(yùn)] 反方位角back axle 后（車）軸back away 逐漸后退back at the farm 言歸正傳back at home 回到家里 回家（Back at Home，歌名） 回到家中back around 風(fēng)向反轉(zhuǎn)back arch [土木建筑工程]拱背back angle quadrant [交通運(yùn)輸工程]靠背角量角器back angle of scattering [物理學(xué)]反向散射back angle [機(jī)] 背錐角；后視角back and leg dynamometer [體育]背腿測(cè)力器back and leg aches [地球科學(xué)]背與足的疼痛