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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：

　　Linguists also make great use of structured sessions, in which they systematically ask their informants for utterances that describe certain actions, objects or behaviors. (test3 passage 3)

　　● 分析：

　　本句主句为“Linguists also make great use of structured sessions”;“in which they systematically ask their informants for utterances that describe certain actions, objects or behaviors.”为which引导的定语从句，做structured sessions的定语;“that describe certain actions, objects or behaviors.”为定语从句，做utterances的定语，关系词为that。