国家技术标准协会以及博尔德的科罗拉多大学的迈克尔·索普和他的同事们已经找到了更好的方法。

Michael Thorpe andhis colleagues at the National Institute of Standards and Technology, and theUniversity of Colorado, both in Boulder, have been looking for somethingbetter.

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佛吉尼亚jkm技术公司，佛吉尼亚大学和科罗拉多州的研究人员进行了这项调查。

Researchers from the JKM Technologies company in Virginia, the University of Virginia and the University of Colorado did the study.

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