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back lining：安全衬砖层

back extraction 反萃取 | back lining 安全衬砖层 | back pressure 反压力

half back lining：后身半衬里

后身里 back lining | 后身半衬里 half back lining | 总肩 across back shoulders

bood back liner lining：(书本)封面衬里

bood back liner jacket 书本封面套 | bood back liner lining (书本)封面衬里 | bood back liner shavings 书籍纸切边

back link：后连杆

back light 后灯 | back link 后连杆 | back mirror 后视镜

back pitch：背节距

back piece 背材 | back pitch 背节距 | back pitch 铆钉背距

back pitch：铆钉背距

back pitch 背节距 | back pitch 铆钉背距 | back plan 底视图

back pitch：橫節距(鉚接)

"齿背","back of tooth" | "横节距(铆接)","back pitch" | "后扶架","back rest"

back pitch：后节距

反位锁 back lock | 后节距 back pitch | 后廊期 back porch period

back and front pitch of awinding：绕组的前后节距

back and forth来回 | back and front pitch of awinding绕组的前后节距 | back and stopping trial倒车及停车试验

back and front pitch of a winding：绕组的前后节距

back and forth 来回 | back and front pitch of a winding 绕组的前后节距 | back and stopping trial 倒车及停车试验

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