网页Quite a few of them are stone arch-bridges. 1961年,云南省建成了一座世界最长的独拱石桥,名叫“长虹大桥”, In 1961, Yunan Province completed construction of the longest single-arch stone bridge in the world called “Changhong Bridge”. 石拱长达112.5米。 The stone-arch measures 112.5 meters in length.