The bus picks up speed with a touch at the accelerator. 把加速器轻轻一踩，车子的速度就加快了。
Through a accelerator the scientist might let the particles' speed up to velocity of light, and by colliding to research the law of energy of the microworld. 科学家通过粒子加速器使粒子达到光速后，互相进行碰撞，来研究微观世界的能量定律。
