对GGE 作单值分解，并以第一和第二主成分近似之。

The GGE data is then subjected to singular value decomposition and is approximated by the first two principal components.

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根据第一主成分和第二主成分的特征向量计算各时间段的第一主成分和第二主成分的指标值。

Then utilizing principal component analysis, the author analyzed the data of each period and concluded that the first and second principal component's accumulative proportion is more than 85 percent.

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第二主成分体现了蜜蜂翅脉角的大小，东岱和张用新2的蜜蜂翅脉角最大，森林公园的蜜蜂翅脉角最小。

In factor 2, mainly representing wing venation angle variation, the honeybees' wing venation angles of Dongdai and Zhangyongxin2 group were biggest and Senlin Park group was smallest.

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