1.
If undelivered, please return to sender.
如果无法送达，请退回寄信人。
2.
It came back with“ return to sender” stamped on it.
邮件被盖上退还邮寄人的印戳退回。
3.
I am writing to enclose the letter to my old friend Jill, which has been returned to me from the post office with a notice that she has "gone away leaving no new address".
随信附上信件一封，这是我寄给老同学吉利的，但是被邮局退回，说是收信人已离去，无法投寄。
4.
Undeliverable postal materials shall be returned to the senders.
无法投递的邮件,应当退回寄件人。
5.
He said the letter might have been returned to the sender.
他说，信可能已退还寄信人了。
6.
The post office generally will send the dead letters back to the senders.
邮局一般会将挂号的瞎信退给寄信人。
7.
It came back with "return to sender" stamped on it.
信被退回上面印着"退给发信人"。
8.
Article23. Undeliverable postal materials shall be returned to the senders.
第二十三条无法投递的邮件，应当退回寄件人。
9.
If undelivered, return to sender, eg on a letter.
若无法投递, 请退还寄件人（如信件上的字样）.
10.
The undelivered letter has been returned to the sender.
那封无法投递的信已退回给发信人了。
11.
One of the answers he received was from another man who was looking for a job too.
在他收到的回信中，有一封信是一位也在找工作的人寄来的。
12.
I returned the letter unopened.
我把那封信原封退回了.
13.
Parcels which cannot be delivered will be returned to the senders.
无法投递的包裹会退还给寄件人。
14.
The parcel is returned to the sender because the directions is incorrect.
包裹因姓名地址有误而退给了寄件人。
15.
The parcel was returned to the sender because the directions were incorrect.
包裹因姓名地址有误而退给了寄件人.
16.
The parcel be returned to the sender because the directions are Incorrect
包裹因姓名地址有误而退给了寄件人
17.
And offer to send letters to people who are not collecting stamps.
主动给那些不集邮的人寄寄信。
18.
having the postage paid by the sender.
由发信人付款的邮寄。