on the decline 还是in the decline

on the decline
在衰退中，在减弱中

例句：She is on the decline, and may die soon.
她的健康每况愈下，可能不久于人世。

也有in the decline的用法，如下：
Perhaps the largest problem of the industry lies in the decline of credit worthiness with this trend even going further for various reasons.
也许最使本行业头疼的问题是信用质量的下降，而且由于种种原因这种趋势可能还会继续。

Their individual characteristics will show off when the analysis is made against the background of their life in the decline of slavery and city-state.
如果将早期犬儒置于奴隶制度及城邦走向衰落的背景中来理解，那么其言行上的个人特征就凸现出来。

参考资料：Dict.cn

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