他摔倒时额头碰在了路边镶边石上.He hit his forehead against the kerb when he fell.汤姆跌倒时,他的额头撞在路边的镶边石上.Tom hit his forehead against the kerb when he fell.在雾中他用手杖摸索街道的镶边石.In the fog he felt for kerb with his walking stick....

“镶边石”的英语可以翻译为：kerbstone ...