记录字段与类不同，它们会作为属性自动公开，并用于创建和复制记录。
Record fields differ from classes in that they are automatically exposed as properties, and they are used in the creation and copying of records.
记录字段与类不同，它们会作为属性自动公开，并用于创建和复制记录。
Record fields differ from classes in that they are automatically exposed as properties, and they are used in the creation and copying of records.
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