1993年， 宾夕法尼亚州立大学的研究人员首次发现了一颗系外行星。
The first such new world was discovered in 1993 by researchers at Pennsylvania State University.
她是宾夕法尼亚大学心理系毕业生。
贵州罗甸纳水剖面是研究宾夕法尼亚亚系牙形刺和各阶界线的良好剖面。
The Nashui section of Luodian, Guizhou is a good section for the study of the Pennsylvanian conodonts and the stage boundaries.
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