State-of-the-art suspension guarantees a smooth passage over the bumpiest road.

最先进的减震悬架保证汽车在最崎岖不平的道路上也可以平稳通行。

I then didn't think much about it, but now with the bumpiest mountain roads staring in my face, I think something needs to be done about it.

我当时没有多想，但现在我面对着的可是最为崎岖不平的山路，得采取点措施了。