早期虚拟人技术的研究集中在人体建模和底层动作控制技术。

The early researches focus on human modeling and low level motion control technology.

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因此有必要对光网络物理底层关键技术进行研究。

So, it is necessary to study key technologies of physical layer of optical network.

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因此有必要对光网络物理底层关键技术进行研究。

So, it is necessary to study key technologies of physical layer of optical network.

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