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。
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