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2013ŵѧ˵-ɭ(Peter Hansen)

˹˵úɭ֥Ӹѧһλѧҡ1952ŵݡҵ1974ѧ(Utah State University0ѧѧʿѧλ 1978մѧ(University of Minnesota)þѧʿѧλ1981ת֥Ӹѧ

˹?ɭ֥ӸѧúѧڡҪĹڷھúͽомΪҪĹطĿǰɭȶۺ͵ݹ龭ѧоڶۺ;еá

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