Individuals specialize in producing different goods or services, and then exchanging these goods on terms they agree upon.
每个个人都专精于生产某种商品或提供某种服务，然后在双方都认同的条约下交换这些商品或服务。
Individuals specialize in producing different goods or services, and then exchanging these goods on terms they agree upon.
每个个人都专精于生产某种商品或提供某种服务，然后在双方都认同的条约下交换这些商品或服务。
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