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1
这两个文件都编写为人类可读懂的；您完全可以尝试着在浏览器中打开它们，研究一下源文件。
Both these are written to be readable by humans; you're welcome to bring up either in your browser and examine the source files.
2
若某人给您发来一封带附件的邮件，尝试用预览窗格打开该附带文件。
If someone sends you a message with an attached file, try opening the file using the preview pane.
3
当您尝试在一个替代的PDF阅读器打开这些文件，然后你会看到此错误消息。
When you try to open these files in an alternative PDF viewer, then you will see this error message.

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