What you are seeing here is an open-pit mine in the U.S., and to give you an idea of the dimensions of this mine, if you look in the top right-hand corner, the little crane you can see, that is a giant crane.
大家看到的是美国的一个露天矿 为了让大家对这个矿的大小有个概念 如果你看右上方的角落，那个小起重机 那其实是一个巨型起重机