Where's the pencil sharpener?

The manual sharpener of the sharpener generally has a double-section knife groove, and a good grinding effect can be achieved by putting the knife on the knife groove and pulling it a few times.

As shown in the figure:

The specific use method is as follows:

1. First find a clean plane to suck the sucker.

2. Put it on the table, there is no air in the sucker, and then press the handle hard.

3. After fixing the sucker, pull it several times at the V-shaped mouth of the sharpener.