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back-scratcher：背挠

back-scatteringthicknessgage 反向散射厚度计 | back-scratcher 背挠 | back-seatedvalve 后座阀 强迫就位阀

back-set bed：逆流层

back-selling ==> 逆向销售 | back-set bed ==> 逆流层 | back-setting effect ==> 逆流效应

back-spiker：钉道工

back rule 背缘尺 | back-spiker 钉道工 | back veneer 背[板]单板

back bridge wall：挡烟桥,火桥

back bridge relay ==> 反桥接继电器=>被呼者継電器 | back bridge wall ==> 挡烟桥,火桥 | back bulb ==> 背生鳞茎,衰老球根

back up chain tongs：咬定链钳

back twisting 反向加捻 | back up chain tongs 咬定链钳 | back up information 后备信息

back clearance angle：车刀纵向后角

back clearance || 背隙(螺纹) | back clearance angle || 车刀纵向后角 | back clipping on || 后向剪裁打开

back bone,vertebral column,spine：脊椎骨

\\"背部\\",\\"back\\" | \\"脊椎骨\\",\\"back bone,vertebral column,spine\\" | \\"回交\\",\\"back cross\\"

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

Permanently mounted to American-made 3/4" hose bibb：永久安装在美国制造的3 / 4 "软管比伯

Features: 特点: | Permanently mounted to American-made 3/4" hose bibb永久安装在美国制造的3 / 4 "软管比伯 | Editorial Review: 编辑审查:

Exhale ,forward：呼,前屈

Bend your knees,inhale,reach up to utkatasana;屈膝,吸,双臂上举,幻椅式 | Exhale ,forward; 呼,前屈 | inhale, lift your spine, hands connected; 吸,伸展脊柱,手连接(地面或小腿)