下图是两个国家的真实有效汇率图表，起始日期为2007年一月——大概就是资产泡沫开始真正被压缩的时间。

And here's a picture of real effective exchange rates for two countries, starting from January 2007 - roughly the point where the bubbles began to deflate in earnest.

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起始有效日期是一个 BPEL 扩展，标准 BPEL 并没有提供它。

The valid-from date is a BPEL extension, standard BPEL does not provide it.

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