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back-up safety device：后备安全设备

后备继电保护 back-up relaying | 后备安全设备 back-up safety device | 后备电源 back-up source

back-up safety device：备用安全设备,备用安全装置

back-up roll | 支撑轧辊,支撑辊 | back-up safety device | 备用安全设备,备用安全装置 | back-up source | 后备电源,备用电源

Back to the salt mine：重新回到工作岗位上

Back to the drawing board 从头开始,失败后另起炉灶 | **Back to the salt mine 重新回到工作岗位上 | Back to the wall 走投无路,陷于困境

Back to save the day：来拯救世界

# The boys are back|我们回来了 | # Back to save the day|来拯救世界 | # The boys are back|我们回来了

back scattering angle：反向散射角

back saw 手锯 | back scattering angle 反向散射角 | back scattering wave 反向散射波

Come back and shed your light upon my way：歸來吧! 照耀我前程

Oh, star of my heaven, 啊! 我的天上明星, | Come back and shed your light upon my way. 歸來吧! 照耀我前程. | Come back! Come back! 歸來,歸來

You show promise as a musician but your lack of practice is holding you back：你有希望成為音樂家,但你懶于練習,使你毫無進展

*No one can hold back the wheel ... | *You show promise as a musician but your lack of practice is holding you back.你有希望成為音樂家,但你懶于練習,使你毫無進展. | 6.stay back or away; show unwillingn...

back siphonage：反虹吸能力

back saw 手锯 | back siphonage 反虹吸能力 | back square 曲尺

back sloper：整坡器,(筑路机的)刮沟刀

back slope 反坡,倾向坡,背坡 | back sloper 整坡器,(筑路机的)刮沟刀 | back space 退位

back somersault：后腾空翻

后排中锋 back row center | 后腾空翻 back somersault | 仰卧撑 back stoop falling

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