You have to remain celibate and, as we will see in the coming week, this is important to Milton. You have to remain sober, and you must eat vegetarian .

你必须独自生活，我们会在下周看到，这对弥尔顿很重要，你必须保持冷静，你还必须吃素。

耶鲁公开课 - 弥尔顿课程节选

you have to be in your top shape,

你必须保持最好的身材状态，

保持身材的理由 - SpeakingMax英语口语达人

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