A file reference does not create a build dependency, so it is possible to build the referencing project without building the dependent project, and the reference can become obsolete.

文件引用则不建立版本的依赖关系，因此有可能生成了引用项目而没有生成依赖项目，于是引用会变得过时。

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Any change to the new project file will cause the old project file to become obsolete.

对新项目文件所做的任何更改都会使旧项目文件过时。

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