道琼斯指数上周累计下挫18%，创下该指数112年历史以来的最大周跌幅。

The Dow tumbled 18% last week, the biggest one-week decline in the average's 112-year history.

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此外，预测模型还可以考虑使用循环模式，如七天的周循环或每季度累计销售趋势。

Additionally, prediction models can take into account cyclical patterns, such as a seven day weekly cycle or a quarterly cumulative sales trend.

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在过去四周，累计下跌超过了30美元。

That brought crude's decline over the past four weeks to more than $30.

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