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机译:
Univ Michigan, Dept Earth & Environm Sci, Ann Arbor, MI 48109 USA;
Birkbeck Univ London, Dept Earth & Planetary Sci, London, England;
Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USAUniv Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA;