这可能会减少用于汽车制造到建筑和桥梁建造等的钢铁需求量。
This could reduce the amount of steel needed to make everything from automobiles to buildings and bridges.
美国的钢铁制造业在1920年领先于世界。
In 1920, the United States led the world in iron and steel manufacturing.
例如，一艘基本的航空母舰是由6万吨钢铁制造的。
For example, a basic aircraft carrier is made of 60,000 tons of steel.
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