与表单一起加载的还有成本列表和审批人列表实例，因此用户可以在采购流程中从列表中选择审批人。

The form is loaded with the instances of the cost and approver list, so that the user can select the approver from a list, in this procurement process.

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getSignatureInstance() 方法实际地构建新的泛型类模板，然后为参数类型的具体列表实例化这些模板。

The getSignatureInstance() method is what actually builds new generic class templates and then instantiates these templates for specific lists of parameter types.

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返回实例列表将显示更新后的状态。

Returning to the list of instances shows the updated status.

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