用户定义的属性就是由客户建立和配置的属性。
User-defined attributes are those attributes that can be established and configured by the customer.
现在你可以正常的建立和配置。
它们的功能非常强大,通常不用任何定制代码就可以建立和配置。
They are quite powerful in that they can usually be set up and configured without any need for custom code.
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