这个比率等于：打开你的电子邮件的人的数量，比上你对其发送电子邮件的人的总数。

This is a ratio determined by the number of people who opened your email against the total number of people to whom you sent the message.

youdao

为了实现非交互式的“支付（payment）”，hashcash 让我向所有想给我发送电子邮件的人都分发一个 标准质询。

To achieve a non-interactive "payment," hashcash lets me issue a standing challenge to anyone who wants to e-mail me.

youdao

例如，两个不同的人可以合情合理地在同一天向我的同一个地址发送电子邮件。

For example, two different people may reasonably want to send E-mail to my same address on the same day.

youdao