He's in the first fifteen.

　　他是業余英式橄欖球隊隊員。

　　The room measures fifteen feet by twenty feet.

　　房間15英尺寬20英尺長。

　　In its heyday, the company ran trains every fifteen minutes.

　　公司在最興隆時期每隔十五分鐘就開出一列火車。

　　Three fives are fifteen.

　　三個五等于十五。

　　They've been at war for the last fifteen years.

　　最近15年來他們一直在打仗。