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back turn pulley：倒带轮

back tube sheet ==> (锅炉的)后管板 | back turn pulley ==> 倒带轮 | back twisting ==> 反向加捻

back-acting shovel：反铲挖土机

back 背 | back-acting shovel 反铲挖土机 | back-angle counter 逆向散射粒子计数器

back-acting shovel：反铲铲土机

back wool 背部毛 | back-acting shovel 反铲铲土机 | back-bone style arch structure tent 脊骨式拱架帐篷

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-face weld：背面焊缝

背面缝隙back crevice | 背面焊缝back-face weld | 背面焊接back-face welding

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

propanone oxime：丙酮肟

propanone hydrogensulphite丙酮合亞硫酸氫鹽 | propanone oxime丙酮肟 | propanoyl chloride丙酰氯

underweight：不合标准的重量重量不足的

underway 在航在航的 | underweight 不合标准的重量重量不足的 | underwirter's guarantee 保险人保证书