After the derivation of the Saint-Venant Equations, water level and discharge of each cross-section are derived by the recursion method and the principle of water balance.
对圣维南方程组进行离散后，用追赶法对各河道进行演算，由水量平衡原理对各结点进行计算，就可求得河道各断面的水流情况。
A fine stick of gradual decrease in cross-section is supported by a fulcrum and keeps its balance in the horizontal direction.
截面渐减细棒由一支点支撑，在水平方向上保持平衡。
The general relation between the damage and strain of the beam cross-section is set up and the stress-strain curves of cross-section are made, through the analysis on cross-section balance.
通过截面平衡分析，建立了混凝土损伤指标与截面应变关系的一般公式，并得到截面广义力—位移关系曲线。
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