The mail is the public service or system by which letters and parcels are collected and delivered.
Your cheque is in the mail.
你的支票在邮寄途中。
You can refer to letters and parcels that are delivered to you as mail.
There was no mail except the usual junk addressed to the occupant.
除了寄给住户的常见的垃圾邮件之外,没有其他邮件。
A mail is an e-mail.
If you have any problems then send me a mail.
如有任何问题就给我发邮件。
mails , mailing , mailed
If you mail a letter or parcel to someone, you send it to them by putting it in a postbox or taking it to a post office.
Last year, he mailed the documents to French journalists.
去年,他把那些文件寄给了法国记者。
He mailed me the contract.
他把合同寄给了我。
To mail a message to someone means to send it to them by means of e-mail or a computer network.