关于理想的、一般性一阶非完整约束系统，这篇文章认为，虚位移满足的关系式即Chetaev关系式是可以被导出的，但该式中的虚位移应当指的是高斯变分.同样，要从动力学普遍方程出发，借助Chetaev关系式导出系统的带乘子的拉格朗日方程，首先需要判断系统是否为理想约束系统，但理想约束条件式中的虚位移也应当指的是高斯变分.对于理想的、一阶线性非完整约束系统，虚位移所满足的关系式和理想约束条件式中，采用的虚位移既可以是高斯变分，也可以是Jourdain变分.

For ideal, general first-order nonholonomic constrained systems, this paper argues that the relation satisfied by the virtual displacement, namely Chetaev relation, can be derived, but the virtual displacement in the relation should refer to the Gauss variation. Similarly, in order to derive the Lagrange equation with multipliers from the general equations of dynamics using Chetaev relations, it is necessary to first determine whether the system is an ideal constrained system, and the virtual displacement in the ideal constraint conditions should also refer to the Gauss variation. For an ideal, first-order linear nonholonomic constrained system, in the relation and ideal constraint conditions satisfied by the virtual displacement, the virtual displacement can be either Gauss variation or Jourdain variation.