speedcopn.<俚>制止汽车超速行驶的警察speedn.速度；迅速v.加速；急行speed reduction gear齿轮减速机器speed characteristic转速力矩特性,速度特性speed up development加快发展speed switching time换速时间speed of circulation循环速度speed shifting lever变速杆speed-torque curve速度扭矩曲线speed skating course速滑课speedlimiting switch限速开关speed up preparation加紧准备