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When we are drinking a cup of milk or juice putted into closed sanitary, there is no air circulation as the straw pressing against the opening, which would make us feel very toilsome to remove the drink out, which even cause overflow due to pressing the cup. However, adding a convex dot will solve all the problems. When Convex-Dot inserts into the closed cup, there will be a larger chip allow the air to circulate. Thus will let us enjoy our drink and there will not be overflow caused by pressing the cup.