单词	pretensioner
释义	pretensioner noun pre·​ten·​sion·​er ˌprē-ˈten(t)-sh(ə-)nər  plural pretensioners : a mechanism that tightens and locks automobile seatbelts in place in the event of a crash or hard braking Pretensioners, like air bags, rely on a small explosive charge to tighten belts fast enough to reduce injuries even in high-speed crashes. Mark Phelan Word History First Known Use 1979, in the meaning defined above
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