letter-box
柯林斯词典
1. N-COUNT 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。
2. ADJ 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
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