The bus picks up speed with a touch at the accelerator. 把加速器輕輕一踩,車子的速度就加快了。
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. 科學家通過粒子加速器使粒子達到光速后,互相進行碰撞,來研究微觀世界的能量定律。