这种数量可观的相互交易随后给社会造成了一定的复杂性。
This considerable volume of intercommunity exchange brought a degree of social complexity in its wake.
金钱能让从未见过彼此的人们相互交易。
It enables people who may never meet to trade with each other.
国家和家庭一样也从相互交易的能力中获益。
Countries as well as families benefit from the ability to trade with one another.
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