A framed opening, as in a wall, door, or window, fitted with fixed or movable horizontal slats for admitting air and light and shedding rain. 固定百叶窗一个有框架的开口处，比如在一堵墙里，门里或窗户里。安装有固定的或活动的水平条板，用来通风、采光、遮雨
One of the narrow openings formed by such slats. 条百页由这种条板组成的狭窄开口
