granite

He was very skilled at pointing down the blocks of granite.

他善于把花岗岩石凿平。

If you're working in steel or granite, redesigning or adding onto something is very expensive.

如果你用钢或花岗岩来工作，重新设计或增加一些东西是很贵的。

Because water is the softest substance in the world, but yet it can penetrate the hardest rock or anything -- granite, you name it.

因为水是世界上最柔软的物质，但是它却可以穿透最坚硬的岩石，或者说花岗岩等石材。