a strong metal that is a mixture of iron and carbon, used for making things that need a strong structure, especially vehicles and buildings

steel girders/rods/struts 钢梁／条／柱

a steel helmet 钢盔

a steel-plated army truck 军用装甲卡车

to force yourself to get ready to do something unpleasant or difficult

[ + to infinitive ] She steeled herself to jump out of the plane. 她心一横，跳出了飞机。