accelerator
n
1 device for increasing speed, esp the pedal in a car, etc that controls the speed of the engine 加速器; 加速裝置(尤指汽車等的油門踏板). =>illus at App 1 見附錄1之插圖, page xii.
2 (physics 物) apparatus for causing charged particles to move at high speeds 粒子加速器.
3 (chemistry 化) substance that causes a chemical reaction to happen more quickly 加速劑; 促進劑.