柯林斯詞典dirt bike (dirt bikes) 1. N-COUNT A dirt bike is a type of motorbike that is designed to be used on rough ground. (在粗糙路面上騎的)摩托車(chē) 返回 dirt bike劍橋詞典a special type of motorcycle designed for riding over rough ground , often used for racing （野外泥土地比賽用的）越野摩托車(chē) 返回 dirt bike