penfeather

例句：

1. 1. The pen was so sharpthat it could write on a piece ofpaper with just one stroke.
   这支笔非常锋利，只需一划就能在纸上写字。
2. 2.She carefully selected the penfeather fromher collection to use for her writing assignment.
   她仔细挑选了一支笔尖来写她的作业。
3. 3. The writer used a penfeather to make his name appear larger andmore prominent on the page.
   这位作家用笔尖让名字在页面上显得更大更显眼。