长盛不衰怎么翻译成英文?

proseperous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.everlasting

I 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。

prosperous

prosperous

长盛不衰：unfading,unflagging,evergreen

Strong point is held not declining