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- 问题详情：Youknowthatballoonsmustbekeptawayfromsharpobjects.Theyalsoneededtobekeptawayfromflames.Afirecanweakentherubberandcauseittobreak.However,inthisexperimentyouwillfindouthowyoucanholdaballoondirectlyinaflamewithoutbreakingtheballoon. Materials...
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