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sack：麻袋

sack n.麻袋 记法:麻袋(sack)把后背(back)压成了S形. lack n.缺少 记法:后背(back)压成了S形就缺少(lack)了脊梁骨(l). tack n.大头钉 T的形状像大头钉. 记法:后背(back)缺少了脊梁骨大头钉(tack)来代. wack n.怪人 W的形状像翅膀.

saddle：马鞍

而有些早期梳状椅背带有卡布里腿、和看起来像马鞍(saddle)的宽厚椅座. 除此也有做成箍形背(hoop-back)、轮形背(wheel-back)、梯形背(ladder-back)的椅子,而温莎椅乃带有宽大的卡不里腿或简单的车枳腿. 17世纪早期,

back-up safety device：备用安全装置

back up protection 后备保护 | back up safety device 备用安全装置 | back up supply 备用电源

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...

the bird of wonder：凤凰;长生鸟

the bird of peace鸽子 | the bird of prey 猛禽 | the bird of wonder凤凰;长生鸟

flange rail：平底轨条

"凸缘皮带轮","flange pulley" | "平底轨条","flange rail" | "凸缘肋","flange rib"