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Steel, too, was well known in ancient China, and steel bits were used in deep drilling for brine and natural gas to depths of around 2000 feet from around the first century AD onwards.
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钢在古代中国也很出名,从公元1世纪以来,钢锥就被用来开采埋藏在2000英尺深的卤水和天然气。
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