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When accident occurs on the surface of the water,survival equipment is not enough sometime, and even if the one who do not know how to swim got the life buoys,they often spread by water, will feel lonely, and his or her power is small when something happens.So the one who knows how to swim can use the new design life buoys with her or him to company to avoid being spread.
The new design life buoys has one more hole,the size of the new hole is just like an adult arm.Before,when life buoys are not enough,so many people dead,and the survivors are spread.Now,the more out of people could put their arms in the holes,swim to the shore with others.