为什么笔一旦掉在地上就写不出字来？怎样补救？ 为什么圆珠笔掉到地上就写不出字来了呢?
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是笔尖里的小圆珠子撞进去了，找个细的东西波动笔尖，会有效果。
质量问题吧、去买只好的、水笔本身就比较容易出此类问题
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