roll bar
noun [ C ] uk/ˈrəʊl ˌbɑːr/ us/ˈroʊl ˌbɑːr/
(尤指赛车顶盖上的)翻车保护杆(或杠)
a metal bar across the roof of a car, especially one used for racing, that protects the people inside if the car turns over
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