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支配恐惧的“打针”是谁发明的？
每个小朋友都有很多问号：到底是哪个狠心人，发明了打针这项酷刑。EyeOpener今日话题，没有针的年代，人类怎么注射？
万物发展史：这些东西是如何从0到今天的？16/21
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