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 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 sa
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.

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
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.