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back digger：反铲挖土机

back cushion 靠垫 | back digger 反铲挖土机 | back firing detective relay 逆弧检测继电器

back donation：逆给予

back coordination 逆配位 | back donation 逆给予 | back electromotive force 逆电动势;反电动势

back donation：反馈(性)

back and fore ribs 牛胴背部 | back donation 反馈(性) | back extraction 反提取;反萃

back-hand drop shot：反手放放球

back-hand 反手击球 | back-hand drop shot 反手放放球 | back-hand half-volley 反手半截击

back-hand drop shot：反手放球

back-hand 反手击球 | back-hand drop shot 反手放球 | back-hand half-volley 反手半截击

back-hand drop shot：反手放短球

back-hand 反手击球 | back-hand drop shot 反手放短球 | back-hand half-volley 反手半截击

back echo：回波

"负效放电","back discharge" | "回波","back echo" | "反萃取","back extraction"

back echo：后瓣回波,后回波

back eccentric wheel 倒行偏心轮 | back echo 后瓣回波,后回波 | back echo reflection 障碍物回波反射

back echo：后波瓣接收的回波信号

交流声,干扰 back drop | 后波瓣接收的回波信号 back echo | 反电(动)势 back electromotive force

back echo：后波瓣接收的回波信号;后辩回波

交流声,干扰,背景 back drop | 后波瓣接收的回波信号;后辩回波 back echo | 出气边,后缘,下降边;[脉冲]后沿 back edge

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