penems

例句：

1. 1. The pen is very sharp.
   这支笔非常锋利。
2. 2. The writer used a pen to write the story.
   那位作家用一支笔来写这个故事。
3. 3. The pen was worn out after writing for hours.
   这支笔在写了几个小时后已经磨损了。