This letter is too important to send by mail.

这封信太重要了，不能用邮递方式送去。

youdao

A loaf of bread, a terrestrial globe, a plastic skeleton and a hamburger. Is there anything you can't send by mail?

一块面包，一个地球仪，一个塑料骨架和一个汉堡包，还有什么邮局不能寄送的东西么？

youdao

For example, it would be possible for you to send by mail train your Sunday lunch leftovers for your friend to eat for his Sunday lunch.

比如，对你来说你可以用邮政列车把你周日午餐的剩饭菜寄给你的朋友做为他周日的午餐。

youdao

Lawmakers in Congress wanted to make it possible to send mail all the way across the United States by land.

VOA: special.2010.04.26

You could come by during my office hours, which are on the syllabus, and you could send me e-mail and set up an appointment.

你们可以在我的办公时间来找我,教学大纲上有写我的办公时间,你们也可以通过电子邮件跟我预约

耶鲁公开课 - 心理学导论课程节选

She is hoping to board a plane next Sunday. "If there are no flights, even until then, I will probably have to send my luggage by mail,and then try and get a train ticket going to Madrid and then maybe try and get back to Korea via New York or via Bangkok or Hong Kong.

VOA: standard.2010.04.19

After all, we have books already and can send them by mail.

FORBES: One Man, One Computer, 10 Million Students: How Khan Academy Is Reinventing Education

Ask, especially in the wake of disaster, for written information and send a check by mail or via website rather than divulge credit card information to an unknown on the phone.

WSJ: Hoaxes, scams abound after disasters like Boston

Send it by snail mail.

FORBES: Magazine Article