Also note that class definitions must appear at the top level of a module, meaning they cannot be nested classes (classes defined inside other classes or functions).

另外要注意，类定义必须出现在模块的最顶层，这意味着它们不能是嵌套的类(在其它类或函数中定义的类)。

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These functions enable a higher-level unit, such as a body control module to monitor the state of the electronic-control unit and prevent secondary problems due to continuing current flow.

上述功能可使车体控制模块等高级单元得以实现，并可监测电子控制单元的状态和防止电流引发的其他问题。

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