concrete bridges

• 混凝土桥

concrete bridges的用法和样例：

例句

1. When we compare a conventional reinforced concrete bridge with fiberglass bridge,a fiberglass is 5 times lighter than conventional concrete.
   当我们比较传统的混凝土桥和玻璃纤维桥时，后者的重量是混凝土桥的五分之一。