在2005年卡特里娜飓风袭击后，由于美国邮政无法提供街道投递服务，全国各地的几十个地方在两周内设立起了邮政设施。

After Hurricane Katrina hit in 2005, mail facilities were set up in dozens of locations across the country in the two weeks that USPS was unable to provide street delivery.

youdao

无法投递，退回原处。

Undeliverable, returned to sender.

《新英汉大辞典》

由于地址字迹不清，致使信件无法投递。

It is impossible to deliver this letter because the address is illegible.

《新英汉大辞典》