https://blog.wongcw.com/2021/02/17/%e5%b0%88%e5%88%a9%e6%9a%97%e7%a4%ba%e8%98%8b%e6%9e%9c%e5%b0%87%e7%82%baapple-pencil%e7%ad%86%e5%b0%96%e5%bc%95%e5%85%a5%e5%8f%af%e8%ae%8a%e5%8a%9f%e8%83%bd/
專利暗示蘋果將為Apple Pencil筆尖引入可變功能