跟话题结构的句法特性无关，本文从语用角度将句法话题分为三种，即事例话题(instance topic)、框架话题(frame topic)和领域话题(range topic)，每一种都由涉及话题结构的特别主题结构体现出来。
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Just like in everyday person-to-person conversation, a discussion topic needs a common frame of reference to carry on the conversation.
就象日常的面对面对话一样，讨论主题需要有一个公共的参考框架以便使对话进行下去。
When you frame the issue as a professional concern and also illustrate how the company relies on you, the topic is more about improving business and less about you whining.
当你设计好这一个议题的时候，同时也是展示公司是多么的需要你的好机会。
A sealed letter with a different frame of mind, coming from all directions, then slightly childish words, are telling an enduring topic.
一封封带着不同心境的信件，从四面八方飞来，那略带稚气的文字，都在诉说一个恒久的话题。
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