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解析:
6．symptoms。本题考查细节。讲座中提到As yet，there is no official psychological or psychiatric diagnosis of an “Internet”or“Computer”addiction．Researchers have only been able to define the constellation of symptoms that constitutes a computer or Internet addiction in different ways。题干将这两句话整合为一句，constellation of之后即为答案，此处意为“对于网瘾或电脑成瘾，在心理学上和精神病学上都没有官方诊断法，专家只能从构成网瘾或电脑成瘾的不同症状来定义了”。