The current concept of mesomeric effect has taken on a related but different meaning.
当前的中介效应概念有一个相关但不同的含义。
As long as its meaning is clear, a saying can be both historic and current.
只要其意清晰，一条谚语可以古今共用。
The first Chapter is the introduction, including research object, research meaning and research current situation.
第一章为绪论，包括研究对象和范围、研究意义和目的、前人研究现状等。
The first Chapter is the introduction, including research object, research meaning and research current situation.
第一章为绪论，包括研究对象和范围、研究意义和目的、前人研究现状等。
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