改进题：International trade occurs when a country does not have enough of a particular item to meet its needs.
译文：国际贸易发生在一个国家没有足够的物品来满足其需求的时候。
改进的译文：当一个国家没有足够的某一特定商品来满足自身需求时，就需要有国家贸易。
改进题：International trade occurs when a country does not have enough of a particular item to meet its needs.
译文：国际贸易发生在一个国家没有足够的物品来满足其需求的时候。
改进的译文：当一个国家没有足够的某一特定商品来满足自身需求时，就需要有国家贸易。
