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

这只是把这巴士的下去。

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

设想一下，你进入了一没有方盘、刹车和的车。

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

不要。的话会器里灌，这样你的车就再也启动不了了。

4.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；原癌基因的功能是编码促进细胞周期运转的蛋白质，所以它算是细胞周期的“”。