letterboxing

n.宽银幕式

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? 请问信箱在哪儿?

On the letterbox, there was the name “Mr. 那儿还有个信箱，可是小得根本塞不进信。

There are two collections a day from this letterbox. 这个邮箱每天开两次。

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