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roll bar

noun
🔊/ˈrəʊl bɑː(r)/
🔊/ˈrəʊl bɑːr/
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  1. a metal bar over the top of a car without a roof, used to make the car stronger and to protect passengers if the car turns over（敞篷汽车顶部起加固和保护作用的）翻车防护杆，防滚保护杆Topics Transport by car or lorryc2