"I think the most frequent type of attack that has been occurring in the past is people showing up with Molotov cocktails and throwing them into or at the homes of Roma in several towns of the country.

VOA: standard.2009.08.22

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

Consider the following passage that he writes: "As to rebellion against monarchy, one of the most frequent causes is the reading of the books of policy and history of the ancient Greeks and Romans.

他曾写道：,反抗君主统治的叛乱，最主要的原因是,古希腊，罗马关于政治和历史的书籍,在民间的传播。

耶鲁公开课 - 政治哲学导论课程节选