这样，就可以为文件类型中已经应用的扩展做一个提示符，您就可以轻松识别出稍后需要清除的文件。

This will keep the already applied extension as a reminder for the document type, and you can easily identify which files you need to remove later on.

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使用的何种具体的命名系统特定于应用程序，但通常可以使用一种与现有应用程序类似的结构，并且这种结构很可能基于某种惟一识别符。

The exact naming system you use is application-specific, but you can usually use a similar structure of your existing application, which will probably be based on some kind of unique identifier.

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本文从应用的角度出发，提出了一种基于傅立叶描述符的颗粒形状自动识别方法。

In this paper, we introduce an automatic particle recognition approach based on Fourier descriptors from the application point of view.

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