the magic sponge
noun UK uk/ˌmædʒ.ɪk ˈspʌndʒ/ us/ˌmædʒ.ɪk ˈspʌndʒ/
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）
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
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！