ordinary mail

基本解释

Clerk: And by air or ordinary mail?
职员：航空邮寄还是普通邮寄？
How did you send the letter, by airmail or by ordinary mail?
你是怎么发送的这信，是通过航天邮件还是普通邮件？
Contrasting with the general safe mail system, the system is based on the ordinary mail agreement.
与一般的安全邮件从协议上改进不同，论文实现的系统是建立在普通邮件协议之上的。

Furthermore, information regarding the largest brokerages is only provided via ordinary mail, too late for an investor to review prior to making an investment decision.
FORBES: NASD Threatens Suit Over The Siedle Directory of Securities Dealers (March 1, 2002)
Justice Stephen Breyer said that in today's world, a registered letter is worse than ordinary mail, noting that "we don't all have butlers at the door" and asking why the U.S. Post Office can't be more flexible, like Federal Express.
FORBES: Magazine Article
Photo attachments require huge gobs of bandwidth compared with ordinary e-mail.
FORBES: Digital Rules