这封信因地址不详细而退还寄信人。

The letter was returned to the sender because the directions were insufficient.

youdao

相当大量的数据存储在云中心，服务器的地址不详。

And a vast amount of data is stored in the cloud, on servers whose location may be unknown.

youdao

若因地址不详无法送达，运费不予退款。

Ruoyin address is unknown can not be served, fees are not refundable.

youdao