Brief background introducing the series. Theoretical introduction.
系列讲座背景知识简介，理论介绍。
The paper gives a theoretical introduction of the risk of price fluctuations.
本文首先对房价波动风险进行理论介绍。
In outline, it falls into four parts: preamble, theoretical introduction, substantial contents and conclusion.
全文在结构上由引言、导论、分论和结语四大部分构成。
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