1、The aircraft had reached its cruising altitude of about 39,000 feet.
那架飛機已經(jīng)達到了大約三萬九千英尺的巡航高度。

2、Captain: This is Captain Browning and we 're at our cruising altitude of approximately 35,000 feet.
機長：我是布朗寧機長，我們正在大約三萬五千英尺的巡航高度飛行。

3、This height is also the frequent cruising altitude of commercial airliners.
這一高度也是商務航線的常用巡航高度。

cruising altitude翻譯