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.
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。
Moreover, the comparison and analysis between the classical method and finite element method are carried out.
对设计与优化的经典连续介质力学方法和有限元数值模拟方法进行了比较与可行性分析。
A new technique named local aperture grid optimization arithmetic was presented to improve the efficiency of the classical method.
为改善计算效率，提出了一种局部口面网格优化算法对射线追踪法进行改进。
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