吊桥的起源最早的吊桥大概要算那种两端用能够支撑住自身重量的木头固定,然后顺着绳子一步步地挪过去的桥了(图1)。后来人们又做了改进,就是像图2一样增添了许多网子,这比最原始的吊桥又先进了一步,比如在日本的绘画里就保留着这样的画面。像这样的吊桥,早期只能一次渡过一个人,非常不便,于是人们萌发了建造吊桥的想法。然而到底是什么时候,人类开始齐心协力建造了吊 Origin of Suspension Bridge The earliest Suspension Bridge probably consisted of a bridge that was fixed at both ends with wood that supported its own weight and then moved along the rope step by step (Figure 1). Later, people made improvements, that is, they added many nets like the one in Figure 2, one step further than the original suspension bridge. For example, such paintings are still preserved in Japanese paintings. Such a suspension bridge, early only spend one person at a time, very inconvenient, so people germination of the idea of ​​building a suspension bridge. In the end, however, humans started to work together to build a crane