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　　>>>拓展阅读：手把手教你六步搞定雅思阅读长难句分析

　　● 题目：

　　Eye position in freshwater dolphins, which often swim on their side or upside down while feeding, suggests that what vision they have is stereoscopic forward and downward. (test1 passage 2)

　　● 分析：

　　本句的主句为“Eye position in freshwater dolphins suggests that…”;“which often swim on their side or upside down”为which引导的定语从句，作freshwater dolphins的定语;“while feeding”为while引导的状语，分词短语作状语;“that what vision they have is stereoscopic forward and downward.”为that引导的宾语从句，作suggest的宾语;“what vision they have”为what引导的主语从句，作is的主语。