短语词组短语billiard -ball 台球图片collision billiard -ball 弹性碰撞billiard d ball 台球用球;撞球composition billiard -ball 人造象牙台球Hairy billiard ball 毛球定理The Billiard ball classroom 撞球教室Deluxe Billiard Ball Bearing 豪华弹子球携带 返回 billiard ball