Of course you're going to get more involved in people you encounter frequently.

当然你会和你经常碰到的人,交往得更频繁。

耶鲁公开课 - 心理学导论课程节选

Now, the Greeks were not unique in history in constantly being at war.

希腊人在历史中,并非唯一频繁遭受战火的民族

耶鲁公开课 - 古希腊历史简介课程节选

So who the sender is, so maybe you could keep track of just who your most frequent correspondents are and if you keep seeing the same personfrom person X or person Y coming into your inbox and clearlyI like having a dialog with these people or have to for work, that might in fact bubble up in your inbox.

谁是发送者，你可能会保留最近跟你联系最频繁的人,如果你发现某某人频繁发送邮件给你,这说明你喜欢和这些人保持联系,可能因工作的原因必须保持联系,那么该邮件就有可能，上升到你邮件的最上方。

哈佛公开课 - 计算机科学课程节选