收发室的英文：
a mail room

参考例句：

a message centre
通讯社,收发室

Three outward-bound envelopes, all marked Private and Confidential, had come through the mailroom
三封标明“密件亲启”的外寄信件送到了邮件收发室。

mail是什么意思：
n. 邮政，邮递；邮件；盔甲
v. 邮寄；给…穿盔甲

Send the memo by express mail.
把这份备忘录用快递寄出。

mail and luggage van
邮政行李车

This parcel came in the mail today.
这个包裹是今天邮来的。

Cn you please confirm that you have received this mail.
您能否确认已收到此邮件

The mail was delivered late today.
今天邮件送得迟了。

room是什么意思：
n. 房间；空间；机会，余地
v. 居住；住宿；为…提供住处

The room echoed.
屋子里回荡着声音。

There is no room for addition.
没有增加的余地。

They throw into the room.
他们冲进房内。

This is a twilight room.
这是个昏暗的房间。

There is a dusk room.
那个房间有点暗。