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将圆珠笔芯取出,用粗一些的针或大头针在距油面约1厘米的空管处,扎一对相对贯通的孔,然后在纸
Remove the ballpoint pen core, with a thicker needle or pin in the empty tube about 1 cm away from the oil surface, tie a pair of relatively through holes, and then in the paper