If you suddenly become immersed (say, you drive off a bridge or into a lake or river), roll down the Windows as soon as you can.

如果你被水淹了(也就是说，你开车在桥上，或者开进了湖或河中)，尽可能快的摇下车窗。

The bridge will roll himself up to the two ends meet.

这座大桥可以自行卷曲到桥的两端。