To manage any application change involving a persistent domain model effectively, you must coordinate changes in the data, schema, and model.

要有效地管理涉及持久性域模型的应用程序变化，必须协调数据、模式和模型的变化。

youdao

I should say this is an example, in case you were wondering what I was doing. We have also actually seen how to change variables to more complicated coordinate systems.

这只是一个，为了不让你们迷茫的例子，以前我们也学过，怎样在更复杂的坐标系中替换变量。

youdao

For example, the code in Listing 1 draws a square using the rect function, then specifies a change to the coordinate system using translate.

例如，清单1所示代码使用rect函数绘制了一个正方形，然后使用translate修改坐标系统。

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