DITA的核心是一个称为“主题DTD”的XML文档类型定义(DTD)，代表面向主题的信息体系结构的一般构造块。

At the heart of DITA, representing the generic building block of a topic-oriented information architecture, is an XML document type definition (DTD) called "the topic DTD."

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一般构造材、电线杆、枕木、坑道支撑材、纸浆材。

General construction, utility poles, railway sleepers, props, temporary construction materials and pulp.

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论述了铝合金遮阳的一般构造形式、荷载取值及结构计算方法、叶片制造工艺及表面处理技术。

This paper introduces general structure type, load value taken and structure calculation method, fin manufacture and finishing technics of aluminum alloy sun shading system.

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