pencil sharpener

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A primarily functional object, the design of the pencil sharpener hasn’t really changed much over time.
卷笔刀是一种强调实用功能的小物件，对于它的设计一直以来都没有太大的变化。
The Swing Blade pencil sharpener, though not the fastest way to sharpen your pencil, is ideal for soft-leaded and color pencils.
平旋刀片卷笔刀虽然不是最快的卷笔刀，但却很适合削软头的彩色铅笔。
When learning computer programming, I found it helpful to look at a function like a pencil sharpener. A parameter was a dull pencil, inside processes sharpened and returned a sharp pencil.
我在学编程时，常把程序比作卷笔刀，而把参数比作钝铅笔，经过处理我们就得到尖铅笔了。

To make it,you need a milk carton, a pencil,a ballpoint pen, scissors and a pencil sharpener.
Because I borrowed her pencil sharpener.
就因为我向她借了卷笔刀。
I didn't 实战 - SpeakingMax英语口语达人

a mechanical, electric, or small handheld device for making a sharp point on pencils