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[英國英語]
The next day there was a letter in her letterbox. 第二天她的信箱裡有封信。
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. (電眡或電腦上的影像) 寬屏帶黑邊的
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