After twenty years, Jill had amassed a huge collection of foreign coins.

二十年来吉尔已收藏了许多外国硬币.

Only after twenty years ' jockeying for power did he attain this position of great influence.

勾心斗角二十年,他才爬上了这把极有权势的金交椅.

After twenty years the cost of producing the chairs has gone down and more and more people are benefiting from the effects.

经过二十年的工本费椅子已下降，而更多的人受益的影响。