系统数学模型的基本模式：行为模式和状态变量模式以及在状态变量模式下的同构与同态系统；
The two basic modes of mathematical model-behavior mode and state variable mode, along with the isomorphic and homomorphic relation between models and real system are described.
在大多数情况下，可以避免这样的变量访问模式。
In most situations it is possible to avoid such a variable access pattern.
这个页面中定义的模式使用变量，比如表名和列名，而不引用词汇。
The patterns defined in this page use variables, such as table name and column name, and don't reference terms.
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