信箱的英文：
mailbox

例句：
The slit of a letter Box

信箱的投信口

I take a peek in my mailbox.

我查看信箱

I push a flyer into a mailbox.

将宣传单投入信箱

Generally, the inbox can always receive junk mail.

一般来说，信箱总能收到垃圾邮件。

I dropped the letter into the mail-box.

我将信投入信箱。

Peep through the letterbox and see if anyone is at home.

透过信箱看家中是否有人。

Post the letter through the slit in the letter box.

把这封信从信箱的投信口投进去。