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。
Since then, Mr. Marsh has automated the process and e-mailed Amy’s filings to United States Attorneys in 350 cases.
自此，玛希先生开始在350个案件当中流水线般操作，且将艾米的资料表格发电子邮件给美国律师。
Ever since then, hundreds of academic papers have been published to improve the efficiency and security of e-cash constructions - to name a few.
从那时起，已发表了数以百计的学术论文试图改善例如电子货币构造的效率和安全的问题。
So beginning in 2007, JD did something no other Chinese e-commerce company was willing to do then or since.
因此从2007年开始，京东做了其他中国电子商务公司当时或以后都不愿做的事情。
So beginning in 2007, JD did something no other Chinese e-commerce company was willing to do then or since.
因此从2007年开始，京东做了其他中国电子商务公司当时或以后都不愿做的事情。
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