科學課程:探索火箭的細部構造與設計科學&動手設計製作水火箭科學實驗作品

Submitted by Jenny on Wed, 09/23/2015 - 10:17
https://www.facebook.com/media/set/?set=a.1002268209812921.1073742012.108530532520031&type=1&l=7be27b04f3

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