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Mr. Hao declined to provide a date for the introduction of a national incentive policy for energy-efficient construction materials and did not specify what materials would qualify.

郝先生拒绝提供实施高能效建筑材料国家激励政策的具体日期，也没有详细列出有资格享受激励政策的具体材料。

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The paper should include introduction, materials, methods, results, and discussion for each experiment, as well as a final discussion of the significance of the three experiments together.

这篇论文应该包括每个实验的介绍、材料、方法、结果和讨论，还要有一个最后的讨论，综合这三个实验的重要性。

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Nanometer-size materials occur all around us in nature, but it was only 20 years ago, thanks to IBM's introduction of the scanning tunneling microscope, that scientists began to observe and manipulate materials at the atomic level.

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"A whole new world opened up with the introduction of acrylics and canvas -- the changing of materials let their creativity just really open up, " said Adrian Mibus, director of Whitford Fine Art gallery in London, which is currently holding a selling exhibition of Aboriginal art.

CNN: Aboriginal artists ignore spotty art market

She says that picking patterns and materials, customizing them to her own needs, and then producing a finished product was an excellent introduction to problem solving.

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