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In the stormy sea,in the water to be threatened by growing crises.Someone might fall into the water at any time,for the first time to rescue the drowning person,as much as possible to save lives. The"One Third"characteristics of divided into three,strive for more time to rescue.Convenient way of opening and closing,not only expand the available area for swimming ring but also extend the length of life,do not throw, do not give up,keep hope alive.