He's in the first fifteen.
他是业余英式橄榄球队队员。
The room measures fifteen feet by twenty feet.
房间15英尺宽20英尺长。
In its heyday, the company ran trains every fifteen minutes.
公司在最兴隆时期每隔十五分钟就开出一列火车。
Three fives are fifteen.
三个五等于十五。
They've been at war for the last fifteen years.
最近15年来他们一直在打仗。