altitude
1.N-VAR 可变名词海拔 If something is at a particular altitude, it is at that height above sea level.
【搭配模式】：oft Nof n
The aircraft had reached its cruising altitude of about 39,000 feet...
飞机已到达约3.9万英尺的巡航高度。
The following day I ran my first race at high altitude.
第二天我第一次在高海拔地区参加了赛跑。
