Applying the step by step approximation, this paper deduces the theory and formulas of calculating the limit carrying capacity of arch bridge on the condition of four hinged destruction.

以四铰破坏为条件，推导引用逐次逼近法计算拱桥极限承载力的理论方法及计算公式。

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Then the new step function space is introduced and stability problem for the finite difference scheme is discussed by means of variational approximation method.

然后引入新的步长函数空间，并在这个空间上，采用变分近似法讨论该格式的稳定性问题。

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By the gaussian approximation and local mode-coupled theory, fused splice loss of step and parabolic index single mode elliptic core fibers have been analyzed, calculated and discussed.

采用高斯近似和局域模式耦合理论，对阶跃折射率分布和抛物线折射率分布椭圆芯单模光纤熔接接头损耗进行了分析、计算和讨论。

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So, what we say here is we need to take a step back here and come up with an approximation that's going to allow us to think about using the Schrodinger equation when we're not just talking about hydrogen or one electron, but when we have these multi-electron atoms.

所有我们这里要说的是,我们需要退回一步,做一个近似,那样可以使我们用,薛定谔方程来考虑,让我们不是仅仅在讨论氢原子或者,一个电子的时候，而是多个电子的原子。

麻省理工公开课 - 化学原理课程节选