1、

At present ageing and out of repair are the main reasons that the normal benefits could not be made. One of the basic jobs for solving this problem is to set up ageing engineering works index evaluation system.

水利工程老化、失修是当前工程不能发挥正常效益的主要原因,建立工程老化指标评价体系是解决该问题的基础工作之一。

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2、

By the Newton's dynamic principle and the constraint equations that the collinear N-body systems satisfy, the problem of solving the set of differential equations is transformed into that of solving the nonlinear set of equations.

依照动力学和运动学原理,建立N体问题共线解所满足的条件方程,把解微分方程组的问题转化为解非线性方程组的问题。

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