Relations are flat, highly structured, strongly typed, and unordered while XML data is ordered, nested, hierarchical, optionally typed and often irregular and semi-structured.
关系型数据是平面的、高度结构化、强类型化、无序的，而XML数据是有序、嵌套的、层次化的、可选类型化的，并且往往不规则且是不完全结构化的。
Unlike the sinusoidal, endlessly repeating waves used in Fourier analysis, wavelets are often irregular and asymmetric, with values that die out to zero as they move farther from a central point.
与傅里叶分析中使用的无限重复的正弦波不同，小波常常是不规则的和非对称的，随着离中心点越来越远，其数值逐渐靠近零。
Unlike the sinusoidal, endlessly repeating waves used in Fourier analysis, wavelets are often irregular and asymmetric, with values that die out to zero as they move farther from a central point.
与傅里叶分析中使用的无限重复的正弦波不同，小波常常是不规则的和非对称的，随着离中心点越来越远，其数值逐渐靠近零。
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