A more generally applicable model of FPL and its PMT are also discussed.

分析更普遍适用的同塔四回输电线模型，对其相模变换方法进行计算分析。

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(The 2010 FPL for a family of four is $22, 050.) However, the number of middle-class and high-income families facing such a challenge increased by 56 percent and 98 percent, respectively.

（2010年四人家庭的国家贫困线是22050美元以下）然而面临同样问题的中高收入家庭却分别增长了56%和98%。

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(The 2010 FPL for a family of four is $22, 050.) However, the number of middle-class and high-income families facing such a challenge increased by 56 percent and 98 percent, respectively.

（2010年四人家庭的国家贫困线是22050美元以下）然而面临同样问题的中高收入家庭却分别增长了56%和98%。

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