这一人群的平均家庭收入由$53，700下降为$44，900（按2006年美元汇率计算）。

The average household income for this group has actually declined—from $53,700 (in 2006 dollars) to $44,900.

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计算各基因型的平均离差度，在各类群内按确定的比率，选取平均离差度大的材料构建资源核心库。

The mean of deflection for each genotype was calculated. The core collection was constructed by the core entries sampled from each set, with the larger mean of deflection.

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