Falling stockpiles of steel in China are another factor driving mills to ramp up steel production, traders say.
交易商说，中国钢铁库存下降，是推动钢铁厂商增加钢铁产量的又一个因素。
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Another factor was the rise of processed foods and, with the invention of the steel roller mill in the late 19th century, the possibility of mass-marketing those foods.
On the foundation of the fifth chapter, the sixth chapter conducted the research to the restriction factor, and proposed the constructive opinion to Hunan steel group.