1.
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。
2.
There are many blind letters every year in the post office.
邮局每年有许多无法投递的信件。
3.
blind department
处理无法投递信件的部门
4.
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）.
5.
The mail clerk was sorting some of the letters that had been misaddressed.
收发员正在那里整理无法投递信件。
6.
It is impossible to deliver this letter because the address is illegible.
由于地址字迹不清，致使信件无法投递。
7.
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。
8.
Undeliverable postal materials shall be returned to the senders.
无法投递的邮件,应当退回寄件人。
9.
Return if undelivered.
无法投递，请退回原处。
10.
Undeliverable, returned to sender.
无法投递, 退回原处。
11.
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。
12.
The duties of a postman are to deliver letters and newspapers.
邮递员的任务就是投递信与报纸。
13.
A postman is a man employed to deliver letters.
邮递员就是被雇用来投递信件的人。
14.
a message transmitted by wireless telegraphy.
通过无线电传递的信息。
15.
Sender's instructions in case of non-delivery (at sender's expense)
如无法投递,寄件人(费用自理)须知:
16.
In case of non-delivery, return to (the) sender
(邮件用语)无法投递时, 退回原处。
17.
The postman delivered the letters promptly.
邮递员投递信件很迅速。
18.
Letters and newspapers should be put into the mailbox from the intake.
、邮递员从投递口中投递信件和报纸。