7：seven，常见短语有：7所学校seven schools，7个保龄球sevenbowling balls、7种鸟seven species of birds。

双语例句

他同女朋友已经交往7个月了。

He had been going out with his girlfriend for seven months

他7个月前在自己的国家建立了个人统治。

He established one-man rule in his country seven months ago.

星期五从盖特威克起飞全程需要7个小时。

Flying out on Friday from Gatwick it took seven hours door-to-door.

七国集团将世界上7个最主要的工业国家归在一起。