Another example for derivation is when you use an extension without an abstract type.
另一个派生的示例是使用不带抽象类型的扩展。
The file will have a generated name with an .ndm extension, for example, lTon_1289524238643.ndm.
已生成的文件扩展名是 .ndm ，例如，lTon_1289524238643.ndm。
The file will have a generated name with an .ndm extension, for example, lTon_1289524238643.ndm.
已生成的文件扩展名是 .ndm ，例如，lTon_1289524238643.ndm。
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