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back up wall：背墙

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

Back-up light：倒车灯

Back-up buzzer 倒车报警器 | Back-up light 倒车灯 | Back wall 后围

Back-up light：倒车灯 Back wall 后围

Back-up buzzer 倒车报警器 | Back-up light 倒车灯 Back wall 后围 | Bad conductor 不良导体

Back-up protection：后备保护装置

back-up power 后备电源 | back-up protection 后备保护装置 | backfill 回填

Back-up buzzer：倒车报警器

Back squab 靠垫 | Back-up buzzer 倒车报警器 | Back-up light 倒车灯

back-up valve：升压阀[在低的环境温度下,为了降低空冷式冷凝器的能力,以维护一定排气压力的设施]

back-up 备用品[零件,设备] ;支持[撑] | back-up valve 升压阀[在低的环境温度下,为了降低空冷式冷凝器的能力,以维护一定排气压力的设施] | back valve 单向阀,止回阀

back-up area：后勤地区

backup absorbent cartridge 后备吸收筒 | back-up area 后勤地区 | back-up yard 后勤场地

backup light：备用灯

辅助频率 back-up frequency | 备用灯 backup light | 后备存储器 back-up memory

pick-up baler：捡拾压机

pick 镐 | pick up baler 捡拾压机 | pick up press 捡拾压机

Barbie Doll make up：芭比妆

-Everyday Neutral make up 清新妆/裸妆 | -Barbie Doll make up 芭比妆 | -Princess Look 皇室公主造型

at sb.'s disposal; in sb's disposal：任某人处理

at rest 宁静的,安静的,过世了的 | at sb.'s disposal; in sb's disposal 任某人处理 | at sb's service 听某人吩咐

Unionism：工会主义;工联主义

Unionist:工会主义者 | Unionism: 工会主义;工联主义 | Unitive:团结的,倾向于团结的