speedupn.加速(增速；高速化；追赶；能率促进)speedn.速度；迅速v.加速；急行speed of mainshaft主轴转速speed time history速度时间史speed-up machine增速机speed-change box变速箱speed plus derived快速传送加分路取出speed up schedules加快进度speed verification速度校核speedup locomotive提速机车speed of model car模型车速度speed of formation形成率