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　　Yet opinion polls suggest that many people nurture the belief that environmental standards are declining and four factors seem to cause this disjunction between perception and reality.
　　分析：
　　本句的主句为opinion polls suggest that…;
　　其中that many people nurture the belief that environmental standards are declining and four factors seem to cause this disjunction between perception and reality为that引导的宾语从句，作suggest的宾语;
　　that environmental standards are declining and four factors seem to cause this disjunction between perception and reality.为that引导的同位语从句，做the belief的同位语，并且在该同位语从句中，
　　environmental standards are declining和four factors seem to cause this disjunction between perception and reality并列，由and连接。