above mean sea level

基本解釋

With an elevation more than 3,659 meters (12,000 feet) above mean sea level, the Altiplano is much higher than the Chaco to the east.
Altiplano海拔3，659m(12,000英尺)，比亞熱帶區(qū)高多了。
IS the parenthetical figure following DH, DA or MDA which, when added to the touchdown zone, runway end, or threshold elevation, will give the DH, DA or MDA in feet above mean sea level.
決斷高度或最低下降高度后括號(hào)中的數(shù)值。它與接地區(qū)、跑道頂端、或跑道頭標(biāo)高相加后即是決斷高度（DA，DH）或最低下降高度（MDA）高于平均海平面英尺數(shù)。
The focal plane of the light is 200 feet above mean sea level, and in clear weather it should be seen at a distance of 23 nautical miles.
燈光的焦平面位于平均海平面以上200尺，如天氣清朗，遠(yuǎn)至23海里的水域也能看見。