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。

So, a glacier is not just a hard block of ice that slides down a slope.

因此，冰川不仅仅是 从斜坡滑下的坚硬冰块。

There it will become a hard red block like a brick, which would be very useful in helping to build a house.

这样，粘土就会变成一种暗红色的块儿，跟砖一样。这种粘土，在修建房子的时候非常有用。

The artists start by packing together an extremely hard block of sand and then shaping the sculpture out of it.

艺术家们首先将一块极其坚硬的沙子打包在一起，然后用它塑造雕塑。