在19和20世纪，我们制造物品：谷物，钢铁，还有卡车。
In the 19th and 20th centuries we made stuff: corn and steel and trucks.
在过去两个时代，我们的钢铁制造领先世界，这些回忆令人怀旧。
Two generations have gone by since the last real steel barons led the world in production and we look back on those days with nostalgia.
然而，在制造钢铁的过程中，我们必须将氧化铁中的氧分子分离出来，这一过程需要大量的能量。
Yet these oxides must be stripped of oxygen molecules in the steel-making process, which requires vast amounts of energy.
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