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太湖流域河湖水系和社会经济演变过程，说明不同时期太湖流域河湖水系的基本功能不同。
Functions of water system connecting rivers and lakes in the Taihu Basin have been different, along with the evolution of our economy and society.
介绍软启动器、变频器的特点，技术演变过程及在城市供水系统中的应用。
This article introduces the features of soft_starter and converter, the procession of the technology evolution and its applications in water supply system for cities.
水系历史演变又表明现代构造运动具有周期性。
The historic evolution shows that the modern tectonic movement is periodic.
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