He lifted the cup for the fifth time this year.

　　他今年第五次舉起了獲勝獎杯。

　　Her mother had just given birth to another child, her fifth.

　　她的母親剛又生了孩子，她的第五個孩子。

　　It's the fifth time that I've been to America.

　　這是我第五次去美國了。

　　He gave her a fifth of the total amount.

　　他給了她總數(shù)的五分之一。

　　It's on the fifth floor, so we'd better take the elevator.

　　那是在六樓上，我們最好乘電梯。