The athletes trained at altitude in Mexico City.

　　田徑運動員在海拔高的墨西哥城受訓。

　　Snow leopards live at high altitudes.

　　雪豹生活在海拔高的地區(qū)。

　　The following day I ran my first race at high altitude.

　　第二天我第一次在高海拔地區(qū)參加了賽跑。

　　The pilot decided to land, but as we lost altitude the wind became stronger

　　飛行員決定著陸，但隨著我們越飛越低，風變得越來越大。

　　The aircraft had reached its cruising altitude of about 39,000 feet

　　飛機已到達約3.9萬英尺的巡航高度。