从随附的图标中我们可以看到在这超过三十年中，单亲家庭旧房销售量和新建房屋销售量上升和下降的百分比趋于相同。

For more than three decades, the sales volume of existing single-family homes and newly built houses tended to rise and fall by about the same percentage, as can be seen in the accompanying charts.

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然而，仔细分析数据后表明，名义GDP飞速增长是通胀率上升的主要原因，但在能源冲击时期，如1974年至1980年，名义GDP增速实际上是趋于放缓的。

But a close look at the data suggests that the problem was mostly caused by extremely rapid nominal GDP growth, which actually tended to slow during energy shock periods like 1974 and 1980.

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科学家们相信，在周期的下一个上升期，也就是在太阳活动趋于频繁时，可能会对地球表面产生冷却效应。

Scientists also believe it may also be possible that during the next upturn of the cycle, when solar activity increases, there might be a cooling effect at the Earth's surface.

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