Note: This use of MathPlayer to get Internet Explorer to render application/xhtml+xml documents should be more widely known, since it's useful even if there is no mathematics in the document.
注：这种用 MathPlayer 来让 Internet Explorer 呈现 application/xhtml+xml 文档的做法应该得到推广，因为即使文档中没有数学表达式，也很有用。
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