英语翻译

英语翻译
But the idea that the journalist must understand the law more profoundly than an ordinary citizen rests on an understanding of the established conventions and special responsibilities of the new media.
这句话的主谓宾结构什么的我都懂,就有一个细节不太清楚,就是句子的后半部分的 an understanding of the established conventions and special responsibilities of the new media 中special responsibilities 是与understanding并列呢还是和established conventions并列呢?
也就是说这句话的意思是“这个想法是建立在对已形成的传统和新闻媒体的特殊责任的理解之上的”还是“这个想法是建立在对已形成的传统的理解和新闻媒体的特殊责任之上的”.