Given the bumpiness of the road ahead, you might be better off with a crash helmet. 考虑到你面前这条颠簸的道路,你最好还是配个头盔吧。
So the bumpiness, the rising high altitude, and the long duration of these two things made this short distance of the road the toughest. 崎岖不平的道路,逐步升高的海拔,和很长的持续时间使这段路程成为了最艰难的一段。