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把水龙头拧开一点,水会缓缓地垂直流下。如果拿一枝圆珠笔或一把塑料梳子,在羊毛衫或毛料布上用力摩擦使它带电,然后
Unscrew the faucet, the water will slowly flow down vertically. If you take a ballpoint pen or a plastic comb, woolen cloth or woolen cloth to force it friction, and then