To overcome the limits of directly simple sampling and lack of basis of theory, a new construction of edge pyramidalstructure was proposed based on sampling strategy.
采用抽样技术进行边缘金字塔构造，克服了直接二抽取法的缺点及其理论上的不足。
2
In ancient times, the pyramidal power structure made the hierarchical consumption as a reasonable pattern and the literature-art consumption took on the feature of utilitarianism.
古代社会金字塔式的社会权力结构使得等级消费被视为合理的消费格局，文艺消费具有鲜明的功利色质。
3
After calculating the flow field of the pyramidal, the relationship between energy loss, noise and the structure of the valve has been analyzed; the flow channel has been optimized.