compound steel

• 三层钢； 复合钢

compound steel的用法和样例：

例句

1. And Otis Elevator in Farmington, Conn., has switched from wound steel cables to flat steel belts, allowing the sheave and motor to be downsized.
   奥的斯电梯公司已经放弃缠绕式钢缆，改用扁平式复合钢带，以进一步减少绞缆轮与马达的体积。