roller tip pen 水性圆珠管笔
Needle point tip roller pen 针管墨水笔
roller-tip pen
roller-tip笔
以上为机器翻译结果，长、整句建议使用 人工翻译 。
If you give up on tablet writing, you can replace the tip to convert the pen to an old-fashioned roller ball.
WSJ: Putting Pen to Tablet: Using a Stylus With an iPad or iPhone
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