许多美国制造的产品或者服务需要进口货物，而这些货物被记作输入。
That is, many American-made products or services use imported goods as inputs.
商品进口指货物输入国内。
商品出口指货物输往国外，而商品进口则指货物输入国内。
Merchandise exports are goods sent out of a country, whereas merchandise imports are goods brought in.
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