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back lash：轮齿隙

back e.m.f 反电动势 | back lash 轮齿隙 | back plunger type 后部柱塞式(液压梯)

back lash：齿轮齿隙侧向间隙游隙

back-lash 齿轮齿隙 | back-lash 齿轮齿隙侧向间隙游隙 | back-off 补偿

back lash：齿轮齿隙

back-lash spring 消隙弹簧 | back-lash 齿轮齿隙 | back-lash 齿轮齿隙侧向间隙游隙

back lash：背隙

back laid rope 反搓绳 | back lash 背隙 | back lash 后冲

Left Wing Back：左边卫

centre back 中卫 | left wing back 左边卫 | right wing back 右边卫

left back：左后卫

后卫这片场地里也实行"分片负责制",有中后卫(center back)、左后卫(left back)和右后卫(right back). 有时为了防止被对手轻易突破防线,还要有一个拖后中卫(sweeper).

left back：左前卫

half back 前卫 | left back 左前卫 | right back 右前卫

left back：左卫

5.中卫:center back | 6.左卫:left back | 7.右卫:right back

left back：作后卫

half back 中卫 | left back 作后卫 | right back 右后卫

look back upon past or own mistake：反顧

(2) Back: 反觀 look back; | 反顧 look back upon past or own mistake; | 反求諸己 (Confucius) reflect and try to find fault in oneself;

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