Can you explain how the email system works?

你能说明一下电子邮件系统的工作原理吗？

《牛津词典》

Let me give you a quick example of how this works: one day, someone sent me an email that upset me.

让我举一个此条规则起作用的直接例子。一天，有人发给我一封心烦意乱的邮件。

youdao