commercial bimetallic system

• 铁

commercial bimetallic system的用法和样例：

例句

1. It takes many years for a city to build a subway system.
   要完成一个城市的地下铁系统需要花上好几年。
2. The Prussian blue-like ferromagnets are the most promising system to be applied to practice.
   普鲁士蓝类分子铁磁体是目前最有望用于实际的一类体系。