高空用英语怎么说

高空用英语可以说作"high altitude"。它来源于拉丁语，"altus"意为"高"，"altitudo"意为"高度"。例句如下：
The plane was flying at a high altitude.
那架飞机正在高空飞行。
The mountain climbers were trained to withstand the low oxygen levels at high altitude.
登山者接受过高海拔低氧环境下的训练。
The balloons were released into the high altitude air.
气球被放入高空空气中。