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7Regents of the University of Colorado, Curricular Unit: Air Pollution [DB/OL].https://www.teachengineering.org/view_curricularunit. php?url=colleetion/cub_/currieular_units/cub_air/eub_air_curricularunit.xml,2016-02-29.
9Regents of the University of Colorado, Curricular Unit: Sound [DB/OL].https://www.teachengineering.org/view_currieularunit. php?url=collection/cub /curricular units/cub_sound/eub_sound_ curricularunit.xml,2016-02-19.
10Lyn D English, Donna T King. STEM learning through engineering design: fourth-grade students' investigations in aerospace[DB/OL]. http://www.doc88.com/p-7018943203601 .html,2016-02-19.
