steel

The modern skyscraper's internal frame is made of high-strength steel.

(Chinese) 现代摩天大楼的内部框架由高强度钢材制成。

Most kitchen knives are made of stainless steel because it doesn't rust easily.

(Chinese) 大多数厨用刀具都是不锈钢做的，因为它不容易生锈。