And that's just pushing the accelerator pedal down on this bus.

这只是把这辆巴士油门踩去。

Imagine you enter a car with no steering wheel, no brake or accelerator pedals.

设想一，你进入了一辆没有方向盘、刹车和油门汽车。

Or they can occur in proto-oncogenes, which normally code for proteins that promote the cell cycle - so they're the cell cycle's accelerator pedal.

突变也可以发生在原癌；原癌功能是编码促进细胞周期运转蛋白质，所以它算是细胞周期“油门”。