Here is a firmly fixed point, in contrast to the drifting floes that cover the North Pole; from it all directions are north, and during the six months of darkness the stars circle around a point directly overhead. 与北极上;覆盖的漂流浮冰相比,这里是一个稳定的点。这里所有的方向都是北,在长达六个月的黑夜中,星星围绕的中心点就在头顶。
But that required fixed overhead wires, and rails and platforms, which were expensive, ugly, and inflexible. 但它要求有固定的空中电线、铁轨和站台。