意思是：巡航高度；
句子实例：
It was so large that when its leading edge made contact with ground, its trailing edge was at least as high as the cruising altitude of a commercial airliner.
这颗灾祸之星十分巨大，当它一头撞上地面时，尾端至少还在一般客机的巡航高度。
This includes weather forecasts for destination aerodromes, prognostic charts of significant weather en route and forecast wind and temperature data appropriate to cruising levels.
气象所也为离港航机提供飞行气象文件，包括目的地机场的天气预报，沿途危险性天气预报图，以及适用于巡航高度的风及温度预报数据。
