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It is toys that company children taking baths, which is not only easier for parents to clean kids but also increase the enjoyment of bathing. According to the buoyancy theorem, we screw the toy on the top of the full-water PET bottle to save the water in practical. In the same time, we increase the toy with delight as well.
Chuan Shih Ming-Chieh Yeh Mu-Cuen Yen Li-Xuan Sun Chih-Chiang Liu Po-Han Chen