1、后向弹簧
... backsight回视 backspring后向弹簧 backstaycable拉索 ...
2、复位弹簧
... backskin仿鞣皮织物 backspring复位弹簧 backstoptongs止退钳 ...
3、[机]反向弹簧
... 反向导向器：retrodirector 反向弹簧，回动弹簧：backspring 反向传输激光脉衡：counterpropagating laser pulse ...
4、回动弹簧
... backshaft后轴 backspring反向弹簧，回动弹簧 backstreaming托底单向流 ...