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Ceiling
01
天花板, 顶棚
the highest part of a room, vehicle, etc. that covers it from the inside
Example
He stood on a ladder to change a lightbulb on the ceiling.
他站在梯子上换天花板上的灯泡。
He installed soundproofing material on the ceiling to reduce noise from the floor above.
他在天花板上安装了隔音材料，以减少来自楼上的噪音。
02
云底高度, 云层高度
(meteorology) altitude of the lowest layer of clouds
03
上限, 限制
an upper limit on what is allowed
04
飞行高度上限, 最高飞行高度
maximum altitude at which a plane can fly (under specified conditions)
