The actual meaning of the digital signature should be understood as: "a person who claims to have such and such E-mail address certified this file, and it hasn't changed since then."
数字签名的实际意义应该被理解为：“声称有某某电子邮件地址的人证明了他有这个文件，并且此后此文件未被更改过。”
We have kept in touch regularly since then through e-mails.
我们从此便通过电子邮件定期保持着联系。
Since then, literally thousands of runners have told us at marathon expos or in e-mails that the program has worked for them.
自那之后，成千上万的跑步者通过邮件或在马拉松赛上告诉我们，这个方法对他们真的有帮助。
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