flintify

例句：

1. 1.The stone was flintified by the heat of the fire.
   石头被火的热度变硬了。
2. 2.The ground has been flintified by the rain.
   地面已经被雨水变硬了。
3. 3. The metal was flintified to make it stronger.
   金属被锻造以使其变得更坚固。