These rough roads soon wore the tread of motorcycle tires off.

这不平的路很快就把摩托车轮胎磨平了。

So the bumpiness, the rising high altitude, and the long duration of these two things made this short distance of the road the toughest.

不平的道路，逐步升高的海拔，和很长的持续时使这段路程成为了最艰难的一段。

These rough roads soon wore the tread of motorcycle tires off.

这些崎岖不路很快就把摩托车轮胎磨了。

So the bumpiness, the rising high altitude, and the long duration of these two things made this short distance of the road the toughest.

崎岖不路，逐步升高海拔，和很长持续时使这段路程成为了最艰难一段。

These rough roads soon wore the tread of motorcycle tires off.

崎岖不平的路很快就把摩托车轮胎磨平了。

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，和很长的持续时使段路程成为了最艰难的一段。

These rough roads soon wore the tread of motorcycle tires off.

这些崎岖不平的路很快就把摩托车轮胎磨平了。

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，和很长的持续时使这段路程成为了最艰难的一段。

These rough roads soon wore the tread of motorcycle tires off.

这些崎岖平的路很快就把摩托车轮胎磨平了。

So the bumpiness, the rising high altitude, and the long duration of these two things made this short distance of the road the toughest.

崎岖平的道路，逐步升高的海拔，和很长的持续时使这段路程成为了最艰难的一段。

These rough roads soon wore the tread of motorcycle tires off.

这些崎岖不平路很快就把摩托车轮胎磨平了。

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，和很续时使这路成为了最艰难一。

These rough roads soon wore the tread of motorcycle tires off.

这些崎岖不平的路就把摩托车轮胎磨平了。

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，和长的持续时使这段路程成为了最艰难的一段。

These rough roads soon wore the tread of motorcycle tires off.

这些崎岖不平的路就把摩托车轮胎磨平了。

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，和长的持续时使这段路程成为了最艰难的一段。

These rough roads soon wore the tread of motorcycle tires off.

这些崎岖路很快就把摩托车轮胎磨了。

So the bumpiness, the rising high altitude, and the long duration of these two things made this short distance of the road the toughest.

崎岖道路，逐步升高海拔，和很长持续时使这段路程为了最艰难一段。