研究人员使用心理评估工具来测试研究的有效性。
The researchers used a psychological assessment tool to test the validity of the study.
俄亥俄大学的研究人员使用了一个数据库，该数据库涵盖了1989年至2004年间1万多家公司和6.4万多名不同的董事。
The researchers from Ohio University used a database that covered more than 10,000 firms and more than 64,000 different directors between 1989 and 2004.
为了验证他们的假设，研究人员使用了一些电灯，实际是使用了发光二极管。
To test their hypothesis, researchers took some electrical lights, actually, they were light-emitting diodes.
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