acceleration
/əkˌseləˈreɪʃn; əkˌsɛlə`reʃən/ n [U] 1 making or being made quicker; increase in speed 加快; 促进; 加速: an acceleration in the rate of economic growth 经济发展速率的增长. 2 (of a vehicle) ability to gain speed （指车辆）加速性能: a car with good acceleration 加速性能良好的汽车.
