2. Secondly, based on the inside line of trousers, press the extra parts on both sides to the middle of the inside line.

3. Then don't let go after the success of the first lap, and then start rolling the second lap. It is suggested to hold the trouser legs with internal pressure to avoid deformation.

4. After the left and right sides are finally fixed, stand up and compare to see if the height and tightness of the roll are the same. If the difference is too big, it can be modified.