the inner surface of the top of a

the inner surface of the top of a
the inner surface of the top of a

the inner surface of the top of a
就是指天花板——ceiling啦.the inner surface of the top of a room是ceiling的英文解释.不信你查字典看看,绝对没错!

房间顶部的内表面

好像就是我们所说的“房顶，顶棚”