GWD TN 1 阅读第二篇 should的用法及句意Low levels of straying are crucial, since the process provides a source of novel genes and a mechanism bywhich a location can be repopulatedshould the fish there disappear. 请问文中should的意义

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GWD TN 1 阅读第二篇 should的用法及句意Low levels of straying are crucial, since the process provides a source of novel genes and a mechanism bywhich a location can be repopulatedshould the fish  there disappear. 请问文中should的意义

GWD TN 1 阅读第二篇 should的用法及句意Low levels of straying are crucial, since the process provides a source of novel genes and a mechanism bywhich a location can be repopulatedshould the fish there disappear. 请问文中should的意义
GWD TN 1 阅读第二篇 should的用法及句意
Low levels of straying are crucial, since the process provides a source of novel genes and a mechanism bywhich a location can be repopulatedshould the fish there disappear.
请问文中should的意义?如何解释.

GWD TN 1 阅读第二篇 should的用法及句意Low levels of straying are crucial, since the process provides a source of novel genes and a mechanism bywhich a location can be repopulatedshould the fish there disappear. 请问文中should的意义
虚拟语气,可能.做下参考