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原文:

*   You may not define multiple ``{% block %}`` tags with the same name in the same
    template. This limitation exists because a block tag works in both directions.
    That is, a block tag doesnt just provide a hole to fill, it also defines the
    content that fills the hole in the *parent* . If there were two similarly named
    ``{% block %}`` tags in a template, that templates parent wouldnt know which one
    of the blocks content to use.

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Django Book 翻译