An aircraft, for example, flying supersonic at 50,000 feet can produce a sonic boom cone about 50 miles wide.
例如，一架50,000英尺高处的超音速飞机可以制造出50英里左右宽的音爆圆锥。
The hardened lava extends some 4 miles (6 kilometers) from the cinder cone, and is about 100 feet (30 meters) thick.
变硬的火山岩一直延伸到离火山灰锥4英里（6公里）远的地方，厚达100英尺（30米）。
Well, one way to think about it is imagine that you are walking on c, on the rim of this cone. You have two options.
一种办法就是想象你沿着C走，沿着圆锥的边走，你有两种走法。
应用推荐