high altitude

At high altitudes it is difficult to breathe.

高地方会感到呼吸困难。

The pilot shot up to a high altitude where he let loose full blat.

飞行员将飞机猛地升上了高空，然后全速前进。

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

崎不平道路，逐步升高，和很长持续时间使这路程成为了最艰难。