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機器人：你知道利用下面哪一種液體在圖畫紙上寫字，就可以讓圖畫紙上的字跡隱形嗎？ A、檸檬汁 B、蜂蜜水 C、食鹽水 答案是A，你答對了嗎？我們來看影片的解說。
#科學 #能源 #氣候 #科技 #自然
分級:
片長:
發音:
發行:
導演:
分級: 普遍級
片長: 1 min
發音: 華語
發行: 2018-01
導演: 安偉民
片長: 24 min
發行: 2013-01
導演: 導演:瑪拉歐斯
片長: 48 min
發行: 2017-06
導演: 美國國家地理頻道 製作
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