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为什么跳跳糖碰到舌头后，就会跳起来？
跳跳糖可是芝士君童年的最爱了。小时候每天放学都要把它放在我的嘴里，感受一下活蹦乱跳的感觉。这比过年放鞭炮，可要开心多了，么为什么跳跳糖会跳？
十万个趣味冷知识33/78
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