| 单词 | pirsson, louis v. |
| 释义 | Pirsson, Louis V.Pirsson, Louis V. (Valentine)(1860–1919) geologist; born in New York City. He taught at the Sheffield Scientific School (Yale) (1882–1919), while spending summers doing fieldwork in Montana and New Hampshire for the U.S. Geological Survey. A pioneer in petrology, he devised a new system of classifying igneous rocks. |
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