It can finish the trade by the service product of cross-border deals or movement of natural persons,

中文解释

本文建立了一个简单的钢材进口预测模型，将预测的进口钢材量依据钢材综合成材率转换为粗钢进口量，然后从粗钢需求量和进口量得出中国的粗钢产量。

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