Photographs For Exhibition Only. To be returned to sender, No Commercial Value.

国际摄影展览之照片，展毕退还原作者，无商业价值。

youdao

That would mean that any email coming from an IP address not on the whitelist would be returned to sender.

那就意味着任何电子邮件来自一个IP地址不是会退回给寄件人的误传。

youdao

XFDL forms can provide sophisticated error checking as the user fills out the form, preventing possible errors (and wasted time as incomplete or erroneous forms are returned to the sender).

在用户填写 XFDL 表单时，表单能够提供复杂的错误检查，这样可以避免可能的错误（并避免由于将不完全或错误的表单返回给发送者而浪费时间）。

youdao

Studios, networks and publicists say thousands of letters have been returned to sender or just set aside, and some celebrities have signed up with services that open fan mail for them or stopped opening mail altogether.

CNN: Recovery: Investing in America

Seven of the transfers never arrived, of which only five were returned to the sender.

ECONOMIST: Borders and barriers