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Back-up protection：后备保护

61 Back-up over-speed governor 附加超速保护装置 | 62 Back-up protection 后备保护 | 63 Back-up ssystem 后备继电保护

Back-up protection：备用保护装置

back up plate 推靠板 | back up protection 备用保护装置 | back up store 后备存储器

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：备用堆置场

back up 垫板,背撑,(铸造用语)填背砂 | back up area 备用堆置场 | back up battery 后备电池

backdoor listing：借壳"上市;"买壳"上市

back tax 补缴税款 | backdoor listing "借壳"上市;"买壳"上市 | back-to-back credit 对开信贷

bagged cargo：貸裝貨

2.Back haul 回程托運 | 3.Bagged cargo 貸裝貨 | 4.Back to back charter在傭船契約與主傭船契約之條款完全一致

be on sb's back"=be ill in bed：卧病在床

He is such a bore,I should like to see the back of him. 他那么烦人,我真愿意他走掉. | 2."be on sb's back"=be ill in bed 卧病在床 | He was on his back for three months. 他卧病在床三个月.

before you get beat down：不然我打你

you better back the fuck up and get back in your car|你最好他妈的走回车上 | before you get beat down.|不然我打你 | just gimme my fuckin' money back, all right?|把钱还给我,明白不?

be behind one's back：背着某人说坏话

生病卧床 --- be on one's back | 背着某人说坏话 --- be behind one's back | 不理,看不起,背弃 --- to turn one's back on

steam trap valve：疏水阀

球阀 ball valve | 疏水阀 steam trap valve | 蛇管式换热器 serpentine type heat exchanger

aldermanship：市政官

aldermanry 议员 | aldermanship 市政官 | Alderney 乳牛