音标发音英式音标 [ˈrəʊl ˌbɑːr]美式音标 [ˈroʊl ˌbɑːr]英式发音 美式发音 基本解释（尤指賽車頂蓋上的）繙車保護杆（或槓）。同根派生 roll bar相关词英英字典劍橋英英字典 a metal bar across the roof of a car, especially one used for racing, that protects the people inside if the car turns overroll bar剑桥字典roll bar柯林斯字典