DE Letterbox宽银幕产生器;宽银幕发生器;宽画面孕育发生器
Letterbox Company信箱公司
letterbox format信箱格式
Letterbox House信箱别墅
Letterbox Tool邮筒工具
Letterbox Mailbox邮筒
letterbox inlet矩形进气口
El Letterbox信箱图片
formato letterbox上下黑边
N-COUNT（可数名词） A letterbox is a rectangular hole in a door or a small box at the entrance to a building into which letters and small packages are delivered. 信箱 [英国英语]
The next day there was a letter in her letterbox.
第二天她的信箱里有封信。
ADJ（形容词） If something is displayed on a television or computer screen in letterbox format, it is displayed across the middle of the screen with dark bands at the top and bottom of the screen. (电视或电脑上的影像) 宽屏带黑边的