Because they are backward-looking, they only deal with spam that has already been sent.
因为他们是向后看，他们只处理垃圾邮件已经发出。
The ex post perspective is backward looking.
“事后” 的视角乃是向后看的。
They can even have one eye looking forward and one eye looking backward !
它们甚至可以一只眼睛看前面，另一只眼睛朝后看。
They can even have one eye looking forward and one eye looking backward !
它们甚至可以一只眼睛看前面，另一只眼睛朝后看。
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