It can be inferred from the passage that the occasional failure of some salmon to return to their natal streams in order to spawn provides a mechanism by which
A pristine streams that are near polluted streams become polluted themselves B the particular adaptations of a polluted stream's salmon population can be preserved without dilution C the number of salmon in pristine habitats decreases relative to the number in polluted streams D an environmentally degraded stream could be recolonized by new salmon populations should the stream recover E the extinction of the salmon populations that spawn in polluted streams is accelerated
请问这个D选项怎么翻译啊？ 我来来回回看了几遍，愣是没看出这是啥语法结构，求NN们解释~ an environmentally degraded stream could be recolonized by new salmon populations 后面为什么可以又加一个“should the stream recover”呢？ 后面这部分是倒装吗？ the stream should recover
| 
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2019-11-13 17:03:32
收藏
收藏
