The Suzhou Creek flood control wall (bank protection) Project is a sub-item of the item.

苏州河防汛墙（护岸）工程是该项目的一个子项目。

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This aspect, please refer to the sub-item paper "on earth human society to establish the administrative organization".

这方面，请参考分项论文《论地球人类社会如何设立行政管理组织机构》。

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As the sub-item of Safety Drive Assist system, the theory and experiments of anti-collision technique are researched in this paper.

本论文作为其中智能辅助驾驶系统的一个子项目，对车辆防撞技术进行了理论和实验研究。

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Upon laying your right thumb onto any of these, a sub-menu expands and you can go one level deeper by dragging your thumb to the left of your desired sub-category, and then let go to toggle the item.

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