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I hope I can go from a moral point of view and then pull cans transformation, transformation of the pull ring, making the mouth with a drink when the rim of the contact surface is covered in advance, the contact surface was exposed after opening, so that cans can be avoided pollution caused personal injury. I also take into account the ordinary cans must be finished soon after opening, or easy to spill or pollution, improved pull ring can be opened and closed repeatedly, to avoid waste and food contamination.