The Oslo blast damaged buildings and blew out windows over more than a half-mile radius, filling the area with smoke and littering it with shards of metal.
此次爆炸摧毁了超过半英尺内的建筑和门窗，整个区域充斥着烟雾和炸碎的金属碎片。
2
It is not as much a coincidence as you think, of course. But if something is in orbit, this is the orbital speed at radius r, then always is its total energy is half the potential energy.
但并不是巧合，当然，但如果某物在轨道里，这是在半径r的速度，则总是它的总能量，是势能的一半。
3
Let's say that I gave you a sphere of radius a centered at the origin, or maybe just half of that sphere or some portion of it.