amsl meaning in English

平均海平面以上

The helicopter took the route across lantau island ( highest point 3 , 066 feet above mean sea level ( amsl ) ) via tung chung pass ( approximately 1 , 100 feet amsl )
该直升机经由东涌飞行通道(高出平均海平面约1 , 100尺)飞越大屿山(最高点高出平均海平面3 , 066尺) 。
As the terrain falls away moderately sharply at the end of the 50 metre run , the helicopter became airborne again and travelled a horizontal distance of approximately 100 metres whilst falling through a vertical height of some 100 feet before impacting with terrain for a second time in a nose high attitude at an elevation of 1150 feet amsl . the main body of the wreckage finally came to rest after travelling forward for a further 30 metres
在直升机冲前接近50公尺处，山势颇为陡峭向下，直升机因而再度离地，在半空中冲前约100公尺，而下坠的垂直高度为100尺左右，然后在高出平均海平面1 , 150尺以仰角撞向另一山坡，继而再冲前30公尺后停下，现场遗留主机体残骇。飞行员和空勤员丧生。