Our laboratory has made more than three years of study in this aspect and already designed two sets of systems.

本实验室对此已经进行了三年多的研究，曾先后设计出两套系统。

youdao

Our laboratory has made more than three years of study in this aspect and already designed two sets of systems.

本实验室对此已经进行了三年多的研究，曾先后设计出两套系统。

youdao