Even stampless letters get through, a rare exception for the US Postal Service.

即使是没有邮票的信件也能通过，这对美国邮政服务来说是个罕见的例外。

youdao

Even stampless letters get through, a rare exception for the US Postal Service.

即使是没有邮票的信件也能通过，这对美国邮政服务来说是个罕见的例外。

youdao