农民生产粮食，往往是为了同城市里的居民交换别的生活必需品。
The farmer has always produced the foodstuffs to exchange with the city dweller for the other necessities of life.
牧师呆着同他高傲的教区居民交换了几句劝导或是责备的话，尽了这番责任，也离去了。
The clergyman stayed to exchange a few sentences, either of admonition or reproof, with his haughty parishioner; this duty done, he too departed.
从英属哥伦比亚到不列颠诸岛，都可以看到一些小社区允许居民通过交换劳动时间、食品或其它有价资产来代替货币支付。
Small communities from British Columbia to the British Isles are experimenting with alternative currencies that allow residents to swap work hours, food, or other assets of value.
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