注册与导出对象供其他包使用的作用一样。

Registering is the same as exporting the objects for other bundles to use.

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为了让插件起作用，必须实现和导出某些例程。

There are certain routines that are a must to implement and export, in order to have a working plug-in.

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例如，如果您想要导出一些Wiki页面，您会希望保留一些字符的原始位置，如回车符和换行符，因为这些字符在wiki格式中有特殊的作用。

For example, if you export Wiki pages, you will want to retain the exact positions of characters like return and line-feed because those are given special attention in the Wiki format.

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