zài / zì / rán / jīng / jì / tiáo / jiàn / xià / rén / men / zhǔ / yào / kào / wù / wù / jiāo / huàn / mǎn / zú / xū / yào

在自然经济条件下，人们主要靠物物交换满足需要。

Under a natural economy, people mainly relied on barter to meet their needs.