音標發(fā)音英式音標 [?r??l ?bɑ?r]美式音標 [?ro?l ?bɑ?r]英式發(fā)音 美式發(fā)音 基本解釋（尤指賽車頂蓋上的）繙車保護桿（或槓）。同根派生 roll bar相關詞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劍橋字典roll bar柯林斯字典