should the stream recover怎么接前面的句子理解啊?大榭!The occasional failure of some salmon to return to their natal streams in order to spawn provides a mechanism by which an environmentally degraded stream could be recolonized by new sa

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should the stream recover怎么接前面的句子理解啊?大榭!
The occasional failure of some salmon to return to their natal streams in order to spawn provides a mechanism by which an environmentally degraded stream could be recolonized by new salmon populations should the stream recover.

这是一个倒装的虚拟语气,即if the stream should recover.就是如果环境被破坏的河流得到回复的话,新的salmon就能够通过这种机制识别出来.