当您收到来自不曾相识的人的电子邮件，在您回复之前，肯定想进一步了解一下发邮件的他/她。
You get an email from a person with whom you have never interacted before and therefore, before you reply to that message, you would like to know something more about him or her.
埃德算了一下，大概有上千万素不相识的人已经了解了我们的一切。
From this, Ed has calculated that perhaps tens of millions of people we will never meet already know all about us.
对于那些了解历史的人来说，这是一种似曾相识的情形——确实历历在目。
For those who know their history, it's deja vu all over again - literally.
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