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back flap hinge：明铰链

back firing detective relay 逆弧检测继电器 | back flap hinge 明铰链 | back gear shaft 背齿轮轴

back ground current：维弧电流

back ground ==> (即底影)背景 | back ground current ==> 维弧电流 | back guide ==> 后导板

back ground noise level：背景噪音电平

back gear 背轮 | back ground noise level 背景噪音电平 | back guide 倒车导板

back hand rope：反搓绳

back guide 倒车导板 | back hand rope 反搓绳 | back hand 反向

to back credit import first：输入为先的对开信用证

to back credit export first ==> 输出为先的对开信用证 | to back credit import first ==> 输入为先的对开信用证 | to back L-C ==> 背对背信用证

Don't go whingeing to your mother. Now get back up, you bloody sook：别去找你妈妈哭鼻子 上来,你这个胆小鬼

CLIFF: Aaah! Get back!|... | Don't go whingeing to your mother. Now get back up, you bloody sook!|别去找你妈妈哭鼻子 上来,你这个胆小鬼! | You'll never be a real bull rider if you don't get back up, Cli...

back office force：内勤人员

back off compensate ==> 补偿 | back office force ==> 内勤人员 | back order ==> 返回次序,欠交订货,延迟交货,延期交货

Back Segs：后面片段数

Back Length后面长度 | Back Segs后面片段数 | Back View背视图

back rashers：薄的腌(或熏)肉片

back pressure 反压 | back rashers 薄的腌(或熏)肉片 | back side 胴体 后部

back-reflection pinhole camera：背面反射针孔照像机

back-reflection focusing came 背面反射聚焦照像机 | back-reflection pinhole camera 背面反射针孔照像机 | back-reflection x-ray exami 背面反射

dioptric：折射光学的

dioptre 屈光度 | dioptric 折射光学的 | dioptrics 折射光学

Saturdays are fun：星期六很有趣

6. Saturdays are fun.星期六很有趣. | fun 为不可数名词,"快乐,有趣",在此做表语. | That must be fun. 那一定很有趣.