n.撞擊, 腫塊 ; v.碰(傷), 撞(破), 顛簸
【記】象聲詞
bump v.碰撞＝hit＝knock；n.碰撞聲【例】he couldn't see clearly and ran bump into a tree.昏暗中他看不清一頭撞在一棵樹上。
speed bump
