所谓“虚拟法”就是在分析和解决物理问题时 ,人们恰当地运用假设或想象出来的某些题目中没有给定的或不存在的具有等效性、简捷性的东西 ,如虚状态、虚过程、虚对象、虚条件、虚参考系、虚场、虚物理量等等 ,其功能主要是通过假设或假想去挖掘已知、创造已知、从众多的矛盾中 The so-called “virtual law” is when people analyze and solve physical problems, people use the equivalence and simplicity that are not given or absent in certain hypothetical or imaginary problems, such as the virtual state and the virtual Processes, virtual objects, virtual conditions, virtual reference systems, virtual fields, virtual physical quantities, and so on, whose functions are mainly through hypothesis or hypothesis to excavate known, create known, from numerous contradictions.