云幕 meaning in English

ceiling

After scarcely ten minutes the grey curtains in the sky closed as suddenly as they had parted .
然而还不到10分钟工夫，天上的灰色云幕又突然关闭，正象方才突然张开一样。
The altitude of the lowest layer of clouds
云幕高度最低层云的海拔高度
An unvaried pall of cloud muffled the whole expanse of sky from zenith to horizon
一望无际的云幕蒙住了从天顶到地乎线的整个夜空。
Aom tells very instrument pilot under what visibility ( in terms of runway visual range ( rvr ) ) and or cloud ceiling can the aircraft take off , and under what visibility ( again in terms of rvr ) and visual reference can the aircraft continue the approach to land from the decision altitude ( for precision approaches , e . g . instrument landing system ( ils ) ) or from the minimum descent altitude ( for non - precision approaches ) . there are a number of factors affecting the values of aom
机场最低飞行条件让每名按仪表驾驶的飞行员知道，航空器在什么能见度以跑道能见距离来说及或云幕高度下才可起飞；以及航空器在什么能见度以跑道能见距离来说及目视基准下，才可从决断高度用于如使用仪表著陆系统的精确进场或最低下降高度用于非精确进场继续进场著陆。