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naturally ordered quasi-adequate semigroup：自然序拟适当半群

背靠背:Back-to-Back | 自然序拟适当半群:naturally ordered quasi-adequate semigroup | 回喷:Back-ejecta

back wear：背向磨损

back wave ==> 反射波,反射波 | back wear ==> 背向磨损 | back welding ==> 底焊,退焊法

back geared upright drill press：带齿轮立式钻床

back geared motor 带减速齿轮的电动机 | back geared upright drill press 带齿轮立式钻床 | back grey 印花衬布

back geared upright drill press：背齿轮立式钻床

back-geared ==> 后齿轮的 | back-geared upright drill press ==> 背齿轮立式钻床 | back-hand drainage ==> 倒转水系

back tool rest：后刀架

back to face ==> 反面对反面相叠 | back tool rest ==> 后刀架 | back trace technique ==> 向后追踪技术,回溯技术

tool back plane：切深剖面

tool back clearance ==> 刀具纵向后角 | tool back plane ==> 切深剖面 | tool back rake ==> 刀具纵向前角

back taper tap：倒锥丝锥,机用丝锥

back taper ==> 倒锥 | back taper tap ==> 倒锥丝锥,机用丝锥 | back tax ==> 退缴税

Back swing：上杆, 后挥杆

Back spin 下旋球(後旋球) | Back Swing 上杆, 后挥杆 | Back Tee 发球区(职业男选手比赛时), 后方球座

Back swing：回程

back substitution 回代 | back swing 回程 | back thrusting 背向冲断层作用

back strap joint：贴板接合

back stitch 扣针脚 | back strap joint 贴板接合 | back strap 对接贴板

phenol red：酚红,苯酚磺酞

phenol reagent 酚试剂 | phenol red 酚红,苯酚磺酞 | phenol red test 酚红排泌试验

accessory equipment：附件

accessory equipment 辅助设备 | accessory equipment 附件 | accessory part 附件