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

设想一下，你进入了一辆没有方向盘、刹车和油门的汽车。

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

只辆巴士的油门踩下去。

No. If you step on the accelerator pedal you can flood the carburetor and your car will never start.

不要。踩油门的话会向汽化器里灌油，样你的汽车就再也启动不了了。

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.

基因突变也可以发生在原癌基因；原癌基因的功能编码促进细胞周期运转的蛋白质，所以它算细胞周期的“油门”。