1. Use professional tools: use professional tools to pry open the cover from one side, or insert tools such as screwdrivers and screws into the gap, gently rotate or tap to loosen the iron sheet, and then tear the iron sheet with hands or pliers.

2. Friction method: Rub the top of the can back and forth on sandpaper or coarse brick to expose the gap under the top cover of the can. Polished to a certain extent, clean the top, then hold the cans with both hands and squeeze them hard, and the cans will be opened.

3. Knocking method: find the bulge on the side of the sealed tin can, and gently knock it several times with a rubber hammer or hammer to deform and loosen the sealed tin can. Then insert a screwdriver or pliers into the gap and gently rotate or pry.