经济危机周期性地发生。
对发达国家，新兴国家的经济危机研究报告显示，房价周期与银行破产之间的关联恒定不变。
Research into financial crises in developed and emerging markets shows a consistent link between house-price cycles and banking busts.
在12月份下旬，一直受周期性欧洲经济危机影响而波动的美元重回低位。
In late December, the dollar resumed a decline that has been interrupted only by periodic European crises.
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