Engineering practice makes a distinction between "mathematical models" and "physical models"; the cost of fabricating a physical model can be minimized by first creating a mathematical model using a computer software package, such as a computer aided design tool.
工程实践在“数学模型”和“物理模型”之间作了区别；可以先借助计算机软件，如计算机辅助设计工具，建立数学模型，来降低制造物理模型的成本。