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当你正在灯下写作业时,突然停电了,又没有准备蜡烛,真急人。我想发明一种自发电圆珠笔。这种笔利用笔尖小钢珠转动产生的动能,通过发电装置使动能转
When you are writing a homework, you suddenly have a power outage, and you are not ready for a candle. I want to invent a self-powered ballpoint pen. This kind of pen uses the kinetic energy produced by turning the nib with a small ball to make the kinetic energy turn by the power generation device