the magic sponge

剑桥词典

used humorously to talk about a wet sponge , used during a football game to treat an injured player , that seems to have magical qualities because the player is quickly able to move and play normally again
魔术海绵（戏谑的说法，指足球比赛期间用来治疗受伤球员的湿海绵，因为接受治疗的球员似乎都很快就恢复正常了）
He was rolling around in agony , then the physio rubs him with the magic sponge and he's fine ! 他在地上痛苦地滚来滚去，队医给他擦了擦魔术海绵，于是他就一点没事了！ 返回 the magic sponge