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back step sequence：后退焊接顺序

back step method 逐步退焊法 | back step sequence 后退焊接顺序 | back step welding 逐步退焊法

back step sequence：[后]退焊顺序

[后]退焊法 back step method | [后]退焊顺序 back step sequence | [后]退焊接 back step welding

Move back. Step back, step back：向后,都退后

Shoot it!|开枪 | Move back. Step back, step back.|向后,都退后 | It's beautiful.|真美啊

back turn：逆向匝, 反作用匝

back turn pulley || 倒带轮 | back turn || 逆向匝, 反作用匝 | back up copy || 副本

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

Minstrel Show：化装黑人乐队的演出

show cause 提出正当理由 | minstrel show 化装黑人乐队的演出 | medicine show 走江湖卖药

punctual aspect：準時式;準時體;一次體

punched card 穿孔卡片 | punctual aspect 準時式;準時體;一次體 | punctuation 標點符號用法