In 1920, the United States led the world in iron and steel manufacturing.
美国的钢铁制造业在1920年领先于世界。
Nearly 80% of the iron ore produced around the world is sold to China's steel mills.
中国的铁矿石进口量占铁矿石全球贸易量的80%。
But with the world steel industry deep in the doldrums, who needed iron ore carries?
世界钢铁工业很不景气，谁还需要这些铁矿砂船呢？
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