The working principle and characters of heat pipe are discussed in the paper firstly, because the applications of heat pipe base on them.
本文首先论述了热管的工作原理和特性，热管的应用是以此为基础的。
The paper firstly explains the basic theory of advertising.
本文首先阐释了广告的基本原理。
The paper firstly analyzed the current research at home and abroad.
本文首先进行国内外研究现状分析。
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