本文的主要研究内容有：图像测量的理论及系统设计；
The main content of the thesis is as follows: the theory of picture measurement and the system design;
模型管理的主要研究内容有模型操纵方法和模型表示等。
The major research contents have model controlling and model representation.
本文的主要研究内容有：对各种不同的组播模型、组播路由协议进行了研究与比较；
The main research content of this paper include: different multicast models and protocols are compared and researched;
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