Some people develop altitude sickness when climbing high mountains.

有些人在爬高山时会发生高山反应。

youdao

Altitude illness is divided into three syndromes: acute mountain sickness (AMS), high-altitude cerebral edema (HACE), and high-altitude pulmonary edema (HAPE).

高山疾病可分为三种征状：急性高山症(AMS)、高山脑水肿(HACE)与高山肺水肿(HAPE)。

youdao

According to our experience Altitude sickness is very serious case in high elevation.

根据我们的经验，高原反应是非常严重的情况下在高海拔。

youdao

Similar devices are often used in hospitals, but the consumer version is aimed at aviators, high-impact athletes and those susceptible to altitude sickness.

WSJ: The Latest Fitness Gadgets to Gauge and Goad