短語詞組短語bump up against difficulties 碰到困難bump up against 碰到bump against the door 撞在門上bump against a wall 撞到墻上bump against a tree 突然撞在樹上Bump against a hammer 撞錘C bump my head against 把頭撞到run bump against the wall 突然撞到墻上bump against ten numbers multiplication 撞十數(shù)乘法 返回 bump against