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。

　　A series of five interviews will be spread over two days.

　　一共五次面談，分兩天進行。

　　Can you finish the work by five o'clock?

　　你五點鐘前能完成工作嗎？

　　She has ten years' useful experience behind her.

　　她有十年的經(jīng)驗，能派上用場。

　　Number Ten had nothing to say on the matter.

　　唐寧街十號對此不作評論。