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机译:Massive star formation at the periphery of the evolved giant H II region W 39
Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States;
Astronomy Department, Adler Planetarium, 1300 S. Lake Shore Drive, Chicago, IL 60605, United States;
Department of Physics and Astronomy, University of Wyoming, 1000 E. University, Laramie, WY 82071, United States;