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back space：退格符

back sight 过天顶测天瞄准器 | back space 退格符 | back space 退格

back space key：凿孔条倒退键

back slope || 后坡 | back space key || 凿孔条倒退键 | back space || 退位, (打字机)退格, 返回

back space file：回退文件

back space ==> 退位 | back space file ==> 回退文件 | back span ==> 反向间隔=>後ピッチ

Safe in the back seat：后面更安全

- we're fine back here. - Back's fine.|- 我们坐后面很好 - 后面就行 | Safe in the back seat.|后面更安全 | - Oh, my God. - what's up?|- 哦,天啊 - 怎么了?

back-to-school goods：学生用商品

back-to-front ratio ==> 反-正比 | back-to-school goods ==> 学生用商品 | back-track algorithm ==> 回溯算法

It was a flatbed truck with three huge sewer pipes on the back, so I spent::: It was days：那是一辆拖车,后面有三根大管子

and back up, and we got a rid... | It was a flatbed truck with three huge sewer pipes on the back, so I spent::: It was days|那是一辆拖车,后面有三根大管子 | in the back of this truck, in a sewer pipe, ...

Back fill density：回填密度

Back filling 回填 | Back fill density 回填密度 | Back drain 牆背排水

back and fill：(船顺流而下时)不断地调整船帆使船蜿蜒前进(以避开障碍); 来来回回; 朝三暮四

back and edge 完全地; 全力地 | back and fill (船顺流而下时)不断地调整船帆使船蜿蜒前进(以避开障碍); 来来回回; 朝三暮四 | back and forth 来回; 往复

back and fill：看风驶帆前进

back anchor 副锚 | back and fill 看风驶帆前进 | back and fill 看风驶帆前进;用左右抢风法前进

back and fill：在狭窄水道逆风顺流用左右抢风法前进

back and fill 看风驶帆前进;用左右抢风法前进 | back and fill 在狭窄水道逆风顺流用左右抢风法前进 | back and forth 来回

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