iron是可数名词

只有当iron作为“铁;(食物中所含的)铁质、熨斗、金属工具等才是可数的。

例句He was in irons.

他戴上了镣铐。

Some Technical Problems with Production Process of Synthetic Cast Irons

推广合成铸铁应用的.若干工艺技术问题

It took three men to put the irons on him.

上来三个人才给他上了镣铐。

What kind of irons are you people running over there?

你们那儿的人都用那种计算机硬件？

Production Technique of High CE and Low Stress Gray Irons

高碳当量低应力灰铸铁的生产

Study on Thermal Fatigue Property of Various Matrix Ductile Irons

几种球铁热疲劳性能的研究