If something is at a particular altitude, it is at that height above sea level. 海拔高度
noun [专属名词] 海拔高度；高地；（天体在地平线上的）地平纬度；顶垂线；（等级和地位等的）高级
The aircraft had reached its cruising altitude of about 39,000 feet. 那架飞机已经达到了大约三万九千英尺的巡航高度。
alt(高) + i ＋ tude(表状态， 名词后缀) → 海拔， 高度
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- We are flying at an altitude of 6 000 metres. 我们的飞行高度是6 000米。
- They were flying at high altitude. 他们正在高空飞行。
- The plane made a dive to a lower altitude. 飞机俯冲到较低高度。