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
道路，逐步升高海拔，和很长持续时间使这
路程成为了最艰难
。
So the bumpiness, the rising high altitude, and the long duration of these two things made this short distance of the road the toughest.
崎岖不平道路，逐步升高海拔，和很长持续时间使这路程成为了最艰难。
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