These lumps are ground into very fine powder, and then the powder is pressed into hard blocks.

人们把这些大块石墨，先磨成细粉，又压成硬块儿。

After that, it becomes a very fine brown powder.

之后，它变成一种非常细的棕色粉末。

The difference is that activated charcoal is burned at a higher temperature so it breaks down into a very fine powder which gives it a larger surface area than a chunk of charcoal on your grill.

它们的区别在于活性炭的燃烧温度更高，所以木头能分裂成非常细的粉末，使得它的表面积比你烤架上的块状木炭要大。