飞机在高空中飞行。

The airplane is flying at a high ___altitude.

飞机在8000米的高度巡航。

The plane is cruising at an ___altitude of 8,000 meters.

通过测量恒星的仰角，天文学家可以确定它在天空中的位置。

By measuring the ___altitude of the star, astronomers can determine its position in the sky.