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back play：间隙

back pack 背包式灭火器 | back play 间隙 | back pressure control station 回压控制站

back play：空程 空隙

back peak | 反冲峰 | back play | 空程,空隙 | back porch | 后沿

back play：空程

back plate 挡板,后板,支承板,支点离合器圆盘=>背極板 | back play 空程 | back pollinating 回交授粉

Go back and play：回去嬉戏

But in doing so, he crossed an invisible borderline.|但是这样做 让他穿越了一个无形的边界 | Go back and play.|回去嬉戏 | Go ahead back. Go back.|回去,回去

Back pressure valve：背压阀

Back pressure 背压,反压力 | Back pressure valve 背压阀 | Back rest 座椅靠背

Back pressure valve：回压阀

back-pressure regulator 回压调节器 | back-pressure valve 回压阀 | back-purge system 反冲洗系统

Back pressure valve：止回阀,背压阀

back pack pump tank fire extinguisher |[消]小型背负泵式灭火器 | back pressure valve|止回阀,背压阀 | back scattering|反向(后向)散射

back projection：反射影

back pressure 反压 | back projection 反射影 | back rest 靠背架

back projection operation：反投射运算

back print method 反面印刷法 | back projection operation 反投射运算 | back prop 后撑,后支柱

back rent：欠租

back pay 欠付工资 | back rent 欠租 | back spread 逆差价,缩差

acetabular foramen：髀臼孔

\\"基节窝\\",\\"acetabular cups\\" | \\"髀臼孔\\",\\"acetabular foramen\\" | \\"髀臼窝;髋血凹\\",\\"acetabular fossa\\"

PRTSC PacketRadioTerminal：数据分组无线电发送终端

PRS PacketRadioStation 数据分组无线电发送站 | PRTSC PacketRadioTerminal 数据分组无线电发送终端 | PRV PacketRadioUnit 数据分组无线发送单元