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.他跌倒时,前颚撞在了道路的边石上.He hit his forehead against 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....

“边石”的英语可以翻译为：curb，curbing ...