劍橋詞典a square , white sign with a red letter L on it, attached to the back and the front of a vehicle that is being driven by a person learning to drive （學(xué)開(kāi)車(chē)時(shí)固定在車(chē)身前後的）學(xué)車(chē)牌，紅L字牌 返回 L-plate