Original document structures could not be recognized.

原来的文档结构已经难以理清。

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A: Topics can be nested to create larger document structures.

答：可以嵌套主题以创建更大的文档结构。

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This column demonstrates how you can use XLink's basic functionality to simplify your document structures and reduce your network transmission overhead.

本专栏演示了如何使用XLink的基本功能来简化文档结构和降低网络传输的开销。

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Color murals by photographer Roland Halbe document the completed structures.

WSJ: Spain's Extraordinary Building Boom

The system, according to the researchers, makes spoofing the unique document fingerprints extremely difficult, if not impossible currently, because there is no way to replicate the surface structures artificially.

BBC: NEWS | Technology | Laser spots paper 'fingerprints'

This conference is another important step initiated by the International Centre on Qanats and Historic Hydraulic Structures (ICQHS) - a category 2 centre under the auspices of UNESCO - to collect and document traditional knowledge available on water resources management from around the globe while providing a forum for presenting new views on the topic.

UNESCO: Water Portal | Water Events Worldwide