| 单词 | macarthur, robert helmer |
| 释义 | MacArthur, Robert HelmerMacArthur, Robert Helmer(1930–72) ecologist; born in Toronto, Canada. He moved to the U.S.A. at age 17, studied mathematics and zoology, and earned a Ph.D. in the latter field from Yale. From 1965 he was a professor of biology at Princeton. Building on an early interest in birds, he developed influential theories about natural selections in animal populations. |
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