roseperous一般是指繁荣的，没有突出经久不衰那个意思我想到三个比较常用的：unfading,evergreen.everlastingI love these evergreen tunes. 我喜欢这些经久不衰的老曲子。

His brave deeds in the battle earned him everlasting glory. 他在那场战斗中的英勇事迹为他赢得了永恒的荣誉。

prosperous: adj. 繁荣的,兴旺的 例句与用法: 1. The city at one time must have been prosperous, for It enjoyed a high level of civilization. 这座古城在一个时期准是很繁荣的，因为它曾享有高度文明。

2. At no time has the country been more prosperous than at present. 我国任何时候都没有现在这样繁荣。