卷笔刀用英语怎么说

The English term for "卷笔刀" is "pencil sharpener". This refers to a small device used for grinding the tips of pencils or similar writing instruments to create a sharp point. The process involves passing the pencil through the rotating blades or other abrasive elements of the sharpener, which removes any dullness and restores the pen's ability to write smoothly. Pencil sharpeners come in various designs and sizes, including manual models that require user effort, as well as electric or battery-powered versions that are more convenient to use. They are commonly found in schools, offices, and homes worldwide.