本文主要包括了以下几个方面的内容：首先，介绍了水下作业机械手的特点和组成结构、分析了其工作原理。
The following parts are included in this thesis: Firstly, the characteristic and the structure of the underwater manipulator and its work principle are discussed.
论文的主要工作内容包括以下几个方面。
The main work and achievements of this paper are as follows.
论文的主要工作内容包括以下几个方面。
The main work and achievements of this paper are as follows.
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