the upper interior surface of a room or other similar compartment
(房间等的)天花板。
〈喻〉 (价格、工资或开支的)最高限度,最大限额,上限。参见<Bold>GLASS CEILING</Bold>.
the maximum altitude that a particular aircraft can reach
绝对升限。
the altitude of the base of a cloud layer
云幂底部高度。
the inside planking of a ship's bottom and sides
舱内衬板。
"Middle English (denoting the action of lining the interior of a room with plaster or panelling): from