课本第 97页 :“到东汉时 ,铁制兵器取代了青铜兵器。”战国时 ,铁器在生产领域中已完全普及了。但在军事领域里 ,铁兵器还不能完全取代铜兵器。我国从春秋晚期就应用一种反复烧炼折叠锻打技术 ,从战国起又有生产黑、白心可锻铸铁技术 ,能生产优质铁兵器。但由于比较费工费时 , Textbook page 97: “When it came to the Eastern Han Dynasty, iron weapons replaced bronze weapons.” During the Warring States Period, ironware was fully popularized in the field of production. However, in the military field, iron weapons cannot completely replace copper weapons. China has applied a kind of repeated forging and folding forging technology from the late spring and autumn. Since the Warring States period, it has also produced black and white heart malleable cast iron technology and can produce high-quality iron weapons. However, due to the relatively labor-consuming time,