The seriousness of these symptoms at heights over 8000 m, within 900 m of the summit of Everest, has led to these altitudes being known as the "death zone," and even the best Sherpas and climbers can have trouble making it through.
因此距離頂峰 900 公尺內，擁有「死亡魔界」之稱，就算是最頂尖的雪巴人或登山家都舉步維艱。