International trade and industry cooperation children vehicles transaction is the result of supply and demand for linking the two sides.
国际工贸合作导致的童车交易就是连接供给和需求的双方。
Iron ore as a commodity, its application specificity strong for a long time, both supply and demand of iron ore is the long-term cooperation.
铁矿石作为一种商品，其应用的专向性极强，长期以来，铁矿石的供需双方是长期合作。
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