Edison's efforts to invent an electric light bulb did not pan out until he used tungsten wires.
Edison's efforts to invent an electric light bulb did not pan out until he used tungsten wires.
爱迪生发明电灯泡的努力直到使用钨丝才获得成功。
Edison's efforts to invent an electric light bulb did not pan out until he used tungsten wires.
爱迪生发明电灯泡的努力直到使用钨丝才获得成功。