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在讲解《简史》中“猿手和人手的比较”这一问题时,我事先发给每个学生一根三号针,当第一次让他们从桌上将针捏起时,发现
In explaining the issue of “Comparison of pickpockets and manpower” in “A Brief History,” I issued a three-needle pin to each student in advance. When I first asked them to pick up the pin from the table, I discovered that