基本解释（汽车的）远光灯，大灯。同根派生 英汉例句noun [ U ]If your lights are on full beam, you may dazzle oncoming drivers. 如果你开远光灯，你会让对面来车的司目眩。英英字典剑桥英英字典 If a car's headlights are on full beam, they are as bright as they can be, and directed straight ahead.