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back-acting hay tedder：反向作用式摊草机

back-acting hay tedder ==> 反向作用式摊草机 | back-acting shovel ==> 反铲铲土机 | back-and-forth bending test ==> 反复弯曲试验

back-angle counter：逆向散射粒子计数器

back-acting shovel 反铲挖土机 | back-angle counter 逆向散射粒子计数器 | back-arc basin 弧后盆地

back-angle counter：记录逆向散射粒子的计数管

back-angle ==> 反向角 | back-angle counter ==> 记录逆向散射粒子的计数管 | back-arc area ==> 弧后区

counter, back-angle：背向角计数器

大气压力计数器 counter, atmospheric-pressure | 背向角计数器 counter, back-angle | 背向式计数器 counter, back-to-back

back-lighted shot：逆光摄影

"透光雕绘","back-light scribing" | "逆光摄影","back-lighted shot" | "后向散射","back-scattering"

back-lighted plotting surface：反光绘图面

back-level release ==> 后层释放 | back-lighted plotting surface ==> 反光绘图面 | back-migration ==> 反向移动

back-raking：后清除(由动物直肠內挤压出的粪便)

back-flow 回流;逆流 | back-packing cure 肉的包裹腌制法 | back-raking 后清除(由动物直肠內挤压出的粪便)

back-scratcher：背挠

back-scatteringthicknessgage 反向散射厚度计 | back-scratcher 背挠 | back-seatedvalve 后座阀 强迫就位阀

back-set bed：逆流层

back-selling ==> 逆向销售 | back-set bed ==> 逆流层 | back-setting effect ==> 逆流效应

back-spiker：钉道工

back rule 背缘尺 | back-spiker 钉道工 | back veneer 背[板]单板

air ventilator：通风管

air purifier 空气滤清剂 | air ventilator 通风管 | air-bleed 空气分泄器

sound motion picture, talkie：有声电影

silent cinema, silent films 无声电影 | sound motion picture, talkie 有声电影 | cinemascope, CinemaScope 西涅玛斯科普型立体声宽银幕电影,变 形镜头式宽银幕电影