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back-pedal：背弃

back-packing 背法 | back-pedal 背弃 | back-pinchedsaw 夹背锯

back-and-forth mode：前后扫描方式

back-and-forth bending test ==> 反复弯曲试验 | back-and-forth mode ==> 前后扫描方式 | back-angle ==> 反向角

back-and-forth movement：往返运动,往复运动

back welding || 封底焊 | back-and-forth movement || 往返运动,往复运动 | back-checking || 返回校验

back-and-forth bending test：反复弯曲试验

back-acting shovel ==> 反铲铲土机 | back-and-forth bending test ==> 反复弯曲试验 | back-and-forth mode ==> 前后扫描方式

Exchange back-and-forth sounds with you：外汇来回听起来你

Exchange back-and-forth smiles, loving faces, and other expressions... | Exchange back-and-forth sounds with you?外汇来回听起来你? | Exchange back-and-forth gestures with you, such as giving, taking, a...

back ampere-turn：反安匝数,逆向安匝

反作用 back action | 反安匝数,逆向安匝 back ampere-turn | 平衡重量;平衡锤 back balance

switch back and forth：转换

an index card 索引卡 | switch back and forth 转换 | needless to say 不用说

BP Back Pressure：背压. 反压

BOO Brake On-Off Switch 制动开关@d | BP Back Pressure 背压. 反压d | BP Barometric Pressure 气压=s

BP Back Pressure：违压. 反压

BOO Brake On-Off Switch 制动开关 | BP Back Pressure 违压. 反压 | BP Barometric Pressure 气压

back projection TV：背投电视机

press button switch 按钮开关 | back projection TV 背投电视机 | wall lamp 壁灯

Minstrel Show：化装黑人乐队的演出

show cause 提出正当理由 | minstrel show 化装黑人乐队的演出 | medicine show 走江湖卖药

punctual aspect：準時式;準時體;一次體

punched card 穿孔卡片 | punctual aspect 準時式;準時體;一次體 | punctuation 標點符號用法