这句中的if only是什么词组?

这句中的if only是什么词组?
97.I am always amazed when I hear people saying that sport creates goodwill between the nations,and that if only the common peoples of the world could meet one another at football or cricket,they would have no inclination to meet on the battlefield.
97.每次我听说体育运动能够在国家间建立起友好感情,说世界各地的普通人只要能在足球场或板球场上相遇就会没有兴趣在战场上相遇的话,我都倍感诧异.