fifteen

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柯林斯词典

fifteen /ˈfɪfˈtiːn/ (fifteens)

1. NUM Fifteen is the number 15. 15
In India, there are fifteen official languages. 在印度有15种官方语言。

剑桥词典

They hadn't lost an election in fifteen years .
She was barely fifteen when she won her first championship .
She has served on the committee for the last fifteen years .
He's decided to stand down after fifteen years as managing director .
The levels of trade union and political activism in this country have greatly declined in the past fifteen years .