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There is a bigger groove at the bottom of the cup,can make the water gather together,easy to blot up.
The bottom of ordinary cup is flat, makes it difficult to blot up,result in waste.As for the blot up cup,there is a bigger groove at the bottom of the it,can make the water pooled together,easy to blot up.When there is only a little water, use the ordinary glass is very hard to blot it up.But the bolt up cup can make the rest of the small amount of water gather together, easy to bolt up.