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back substitution：回代

back stress effect 背应力效应 | back substitution 回代 | back swing 回程

back substitution：倒转代换,回代

back strut 后撑,反撑 | back substitution 倒转代换,回代 | back suction 反吸

back swimmer：仰泳蝽

back sweep 後退計算 | back swimmer 仰泳蝽 | back swing 倒转,回摆,回程,回转=>バックスイング

back talk：回嘴

back street 小街 | back talk 回嘴 | back the sails 倒船

back talk：回嘴, 顶嘴(尤指对上级或长辈的顶撞),反唇相讥

back sweetening | 加硫醇后以试硫液脱残余游离硫法 | back talk | 回嘴, 顶嘴(尤指对上级或长辈的顶撞),反唇相讥 | back taper tap | 倒锥丝锥 机用丝锥

back to front：前后颠倒;透彻地

Back to back 背靠背 * | Back to front 前后颠倒;透彻地 * | All night long 整夜 *

back to front turns：由后向前转身

倒滑急停 back stop | 由后向前转身 back to front turns | 保护后方 back up

back track：由原路退回

back stretch 反向铺设水带 | back track 由原路退回 | back valve 止回阀

back up wall：背墙

back up block 支撑块 | back up wall 背墙 | back view 背视图

back vent：后叉

后背宽 across back | 后叉 back vent | 后袋 back pkt.

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