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1, first prepare a rectangular piece of paper.

2. Fold the paper in half.

3. Fold in half again along the red line.

4. Fold down the center line of the left half, and do the same for the right side.

5. Fold down to the right and back from the right to the left.

7. Fold the two corners on the left back and forth to align with the center line, and do the same on the right.

8. Similarly, the middle two corners are folded in half along the left and right red lines respectively, and the operation methods of the back two corners are the same.

9. Then insert the second folded small triangle into the first folded large triangle.

10, finally opened.

Different materials of environmentally-friendly trash cans have different advantages and disadvantages, as follows:

1, plastic dustbin: low cost, portable and easy to wash.

2, metal dustbin: heavy, not easy to move, easy to rust, not corrosion-resistant.

3, wooden trash can: heavy, not easy to move, the box is easy to corrupt, not easy to clean.

4, stainless steel trash can: heavy, not easy to move, the surface is easy to mottle, not resistant to acid and alkali.

5. Ceramic dustbin: heavy, inconvenient to move and high in cost.

6. Cement dustbin: heavy, unable to move and difficult to clean.

7. Open environment-friendly dustbin: garbage is exposed in the open air, and it is in direct contact with air in a large area, which is easy to produce odor, leading to mosquito breeding and bacteria breeding.

8. Uncovered environmentally-friendly garbage bin: avoid the smell of garbage, effectively isolate it, and it is not easy to attract mosquitoes and breed bacteria.

9. Open the environmentally-friendly trash can by foot: free your hands, avoid bending over, lightly step on the lid with your feet, and do not touch the lid of the trash can with your hands, which is cleaner and more hygienic.