flate (使充气) during a collision. Using a seat belt also prevents you from being ejected (弹出) from a car into the path of oncoming traffic. Research shows that when you wear a modern seat belt, you reduce the risk of death or serious injury by 70% or more during an auto accident.
Seat belts have existed in different forms since the early days of automobiles, and they have changed from a single lap belt to the threepoint seat belt we use today. In 1911 the first airplane seat belt was installed. Then, in the 1920's they were used in racecars. By the 1930s, a group of American physicians created lap belts for their own vehicles and urged vehicle manufacturers to provide seat belts on all vehicles.
Dr.C. Hunter Shelden made a major contribution to our safety with his article in the November 5,1955 Journal of the American Medical Association (JAMA). He strongly encouraged the manufacture and use of door locks, airbags, and retractable (伸缩式的) seat belts, like the ones we use today. The modern threepoint seat belt, including a lap belt and a shoulder belt, was introduced as standard equipment on Volvo cars in 1959.
In 1970, the state of Victoria in Australia made the wearing of a seat belt compulsory for every car driver and frontseat passenger. Today many countries have also mandated (授权) the use of fivepoint safety harnesses for carefully designed child safety seats that can protect a child during a serious car accident.
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