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inertia reel

noun
🔊/ɪˈnɜːʃə riːl/
🔊/ɪˈnɜːrʃə riːl/
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  1. a round device that one end of a car seat belt is wound around so that it will move freely unless it is pulled suddenly, for example in an accident（汽车安全带的）惯性卷筒