她轻踩油门加速超车。

She gently pressed the ___accelerator to overtake the car.

在实验中加入少量这种物质可以显著加快反应速度，因为它是一种高效的催化剂。

Adding a small amount of this substance can speed up the reaction significantly, as it works as an effective ___accelerator.

这家初创公司通过加入创业加速器获得了资金和指导。

The startup gained funding and mentorship by joining an ___accelerator.