而汤姆(Tom)，作为一名医学博士，相比于没有背景的人而言，在与医药与健康保健有关的IT主题——如hipaa合规性等方面，其话语可以更有权威性。
Tom, an M.D., was able to speak more authoritatively on it subjects related to medicine and health care, such as HIPAA compliance, than someone without that background.
全知话语的权威性受到限制，叙述者最终被权威话语所规定，叙述本身成为权威话语系统中的一个符号。
The authority of omniscient utterance is limited. The narrator is stipulated by the authoritative utterance finally. Narration itself becomes a symbol in the system of authoritative utterance.
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