Insert the pencil of the pencil sharpener and think of the trunk of this "tree. In the process of using the pencil sharpener, the "trunk" is constantly rotated to make it shorter and shorter. I can't help but think of the consumption of wood, which arouses people's resonance and reflection on environmental protection...

One can arouse people to produce when using it.
Pencil sharpeners that resonate and reflect on environmental protection
When people use it
Can't help but think of the consumption of wood
It is reflective.
......