美国政府有义务优先购买在美国制造的产品，但外国公司仍有可能成为美国政府的供应商。例如，某产品在美国没有生产，这时美国政府将向海外购买。The US government f_____ o________ to prefer US-made products, but it’s still possible for a foreign company to be its supplier. F_____ in_______, if a product is not made in the US, then the US government will buy abroad.