an environmentally degraded stream could be recolonized by new salmon populations should the stream recover should the steam recover 什么意思 什么语法 表虚拟？竟然？假设？
Low levels of straying are crucial, since the process provides a source of novel genes and a mechanism by which a location can be repopulated should the fish there disappear should the fish ther...一样的问题
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发表于 2010-11-22 17:11:23
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