According to measuring the coordinates of each span of long span double arched bridge, the arch axis for every span is determined.
通过测量拱腹各点坐标来确定双曲拱桥每孔的拱轴线。
We stopped at London Bridge, a double-arched formation whose outer span collapsed in 1990, stranding a couple on the other side so that they had to be rescued by helicopter.
我们在伦敦桥停下车来，这是一座双拱桥梁，外延部分在1990年垮塌了。 当时有一对男女被困在桥那一边，只能由直升飞机前来救援。
We stopped at London Bridge, a double-arched formation whose outer span collapsed in 1990, stranding a couple on the other side so that they had to be rescued by helicopter.
我们在伦敦桥停下车来，这是一座双拱桥梁，外延部分在1990年垮塌了。 当时有一对男女被困在桥那一边，只能由直升飞机前来救援。
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