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2.The survey found that mouth directly contact the ordinary cans when we drink. In fact , it is unhealthy.And often occur, some drinks from the mouth leak out, designed after New-Tin cans, the bottle cap component protection, It is a good solution to the problem.3.He ordinary cans are disposable .After using these, we would throw away. It is wast the resource of not putting the cap back on the bottle. In addition,it can not be used for holding things. If add the bottle top, the value will increase.For example, used as a drinking cup or seasoning bottle and so on, and it can used multiple times.