According to the fusion levels, there are data level, feature level, decision level included in data fusion.

从融合的层次结构出发，数据融合技术可分为数据级、特征级和决策级三个融合层次。

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The definition, fundamental, fusion levels, process model, fusion methods of data fusion are summarized firstly.

首先对数据融合的定义、基本原理、融合层次、功能模型、融合方法等几个方面进行了综述。

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The patients were matched according to age at surgery, operative method, curve location, number of fusion levels, and degree of curves.

病人根据手术时年龄，手术方法，侧弯定位，融合阶段的数目，侧弯角度配对。

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Another possibility--the most disturbing one, actually--is that the North Koreans had been telling the truth when on May 12, just two days before South Korea detected the high levels of xenon, they announced they had created a nuclear fusion reaction, a step necessary to the building of a thermonuclear device.

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