n.寬銀幕式

There is a letter in your letterbox. 在你的信箱有一封信。

F: Could you tell me where the letterbox is? 請問信箱在哪兒?

On the letterbox, there was the name “Mr. 那兒還有個信箱，可是小得根本塞不進信。

There are two collections a day from this letterbox. 這個郵箱每天開兩次。

Peep through the letterbox and see if anyone is at home. 透過信箱看家中是否有人。