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When a shipwreck happens, life buoy will be a very necessary thing that keeps a people alive. However, the current life buoy is not that good to meet our needs. It is not easy for a person to put both of his or her arms. Also, those person who have big figures can not use them without great effort. But we know every second during a shipwreck is quite important. So, we should imporve the current life buoy to help us.