为防止受伤在场上保护运动员the spot罚球点把台球放在置球点上临时上场替换他人的不按排定顺序上场的
To prevent injury and protect athletes on the field, the spot penalty spot places the billiard balls on the ball placement spot and temporarily substitutes for others, not in the scheduled order
以上为机器翻译结果，长、整句建议使用 人工翻译 。