http://baike.baidu.com/subview/3909915/3909915.htm
https://en.wikipedia.org/wiki/San_Mateo%E2%80%93Hayward_Bridgehttps://en.wikipedia.org/wiki/Dumbarton_Bridge_(California)
http://baike.baidu.com/subview/3909915/3909915.htm
https://en.wikipedia.org/wiki/San_Mateo%E2%80%93Hayward_Bridgehttps://en.wikipedia.org/wiki/Dumbarton_Bridge_(California)