The paper discusses the water demand volume for ecologic system equilibrium including the minimum water demand volume for water living things in lake and river;
文章探讨了维持生态系统平衡所需的水量，包括河湖水生生物生存的最小需水量；
By using mechanical analysis, the dynamic equation of the system was established, the Lyapunov direct method was applied to obtain stability conditions of system equilibrium points.
通过力学分析，建立了离心调速器系统的动力学方程，应用李雅普·诺夫直接方法得到该系统稳定平衡点的条件。
The main objective of control theory has long focused on the stability analysis of system equilibrium and stabilizing controller synthesis. But these can not meet the practical need anymore.
控制理论长期以来将控制目的主要集中于系统平衡位置稳定性和设计控制器以保证对系统进行镇定上，已不能符合控制系统当今的实际要求。
The main objective of control theory has long focused on the stability analysis of system equilibrium and stabilizing controller synthesis. But these can not meet the practical need anymore.
控制理论长期以来将控制目的主要集中于系统平衡位置稳定性和设计控制器以保证对系统进行镇定上，已不能符合控制系统当今的实际要求。
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