表达式求值的经典算法。
编写代码对算术表达式求值的经典方法由DonaldKnuth描述于1962年(请参阅参考资料)。
The classic approach to writing code to evaluate arithmetic expressions was described by Donald Knuth in 1962 (see Resources). Knuth Outlines three steps.
不过，我们还是先看看表达式求值的经典算法，这样您就会明白W 3eval方法的差异究竟有多少。
First, however, we'll look at the classical algorithms for evaluating expressions, so you can see how W3Eval's approach differs.
我希望您会发现W3Eval是个对表达式求值有益的在线工具，它在某种程度上比经典的方法更简单自然。
I hope you will find W3Eval to be a useful online tool for evaluating expressions in a way that is more natural than the classical method.
基于经典弹性板壳理论推导管壁变形解答，得到管壁变形的解析表达式，并以此计算管壁变形刚度。
After compared with the result of tests and fitting formula, it is reasonable to deduce the resolution of tube wall stiffness based on the elastic theory.
本文中我们在经典风险模型的基础上构造了三类随机变量具有相依性的风险模型并对它们进行了研究，得到了与破产相关的一些变量的表达式或性质。
In this text, based on the classical risk model, we construct and research three kinds of new risk models with dependence. Finally we obtain some expressions or characters of the variables about ruin.
用数值积分来计算长周期和长期摄动，而用经典分析解的表达式来计算短周期摄动，这是很有效的。
It is efficient to compute long-period and secular perturbations by numerical integration, but the classical analytic solution may be used to calculate the short-period perturbations.
本文中，我们以经典风险模型为基础构造了三类风险模型并且对其进行研究，得到了与破产相关的一些变量的表达式或性质。
In this text, based on the classical risk model, we construct and research three kinds of new risk models. Finally we obtain some expressions or characters of the variables about ruin.
同时从经典麦克斯韦电磁场理论出发，推导出复相对介电系数和复相对导磁率的表达式；
Based on the classical electromagnetic theory of Maxwell, the expression of the relative dielectric constant and relative magnetic permeability is deduced also;
将所建立的模型进行适当简化，可得到经典岩石破碎比功三大学说表达式，说明该模型具有一定的普遍性。
In addition, the three classical formulas of the crushing work ratio theory can be obtained by properly simplifying the model, hence, the general applycation of the model is proved.
这一表达式仅依赖于中面的位移分量，后者由一组类似于经典板理论的二维微分方程控制。
This representation relies only on the displacement components of the mid_plane, which are governed by a set of two_dimensional differential equations similar to those in the classical plate theory.
特别地，在一定的条件下，广义振幅阻尼通道的经典容量可以用一个解析表达式表示。
The numerical and analytical results of the entanglement-assisted classical capacity are obtained under some certain conditions.
并分析了产生这种差异的原因，主要是经典强度准则表达式中采用的无拉剪耦合假设和层与层之间理想粘接假设，只适用于单层板或正交各向异性板。
The main reason came from the assumptions of non-tension-shear coupling whose is correct only for lamina and orthotropic laminates, and realistic bond between layers.
并分析了产生这种差异的原因，主要是经典强度准则表达式中采用的无拉剪耦合假设和层与层之间理想粘接假设，只适用于单层板或正交各向异性板。
The main reason came from the assumptions of non-tension-shear coupling whose is correct only for lamina and orthotropic laminates, and realistic bond between layers.
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