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haul back：拉回拉线

haul back 拉回 | haul back 拉回;拉线 | haul back 拉回拉线

back haul：迂回信程, 空载传输

back hang || 后悬垂, 吊臂悬垂 | back haul || 迂回信程, 空载传输 | back head brace || 外门板拉条

back haul：返航载运,后曳

back hand welding ==> 后退焊,反手焊接 | back haul ==> 返航载运,后曳 | back head ==> 机车外门板

Back nine：后洞

Back door"走**"推杆(球从球洞后沿进洞) | Back nine后洞 | Back side洞球场的后洞

back-to-back arrangement：背对背安装

保持架 cage | 背对背安装 back-to-back arrangement | 背锥 back cone ; normal cone

back-to-back arrangement：背向排列

"后退分段(熔接)次序","backstep sequence" | "背向排列","back-to-back arrangement" | "背托","back-up"

back-to-back arrangement：背对背柏靼

保持架 cage | 背对背柏靼 back-to-back arrangement | 背锥 back cone ; normal cone

back-to-back testing：背对背测试

back-scattering 反向散射 | back-to-back testing 背对背测试 | backbone cabling 主干线布线,主干布线

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

steam trap valve：疏水阀

球阀 ball valve | 疏水阀 steam trap valve | 蛇管式换热器 serpentine type heat exchanger

aldermanship：市政官

aldermanry 议员 | aldermanship 市政官 | Alderney 乳牛