a cast-iron bridge的用法和样例：
- Mr Black was a man of cast iron will.
- Cleveland House and the cast iron bridges of Sydney Gardens over the Kennet and Avon Canal.
- A cast iron flange with three adjustable screws will conveniently hold a crown thermocouple.
- Using a system based on a cast iron melting furnace, we have established technology for vitrifying waste such as incinerated ash, casing ash, etc.
- The wound stator core is press fit into a cast iron housing for true and positive alignment as well as efficient heat transfer .