barter peculiar to a seminatural economy

例句：

1. 1. They bartered their old clothes for a newone.
   他们用旧衣服换新衣服。
2. 2.The fisherman traded his catch forfood.
   渔夫用他的鱼换食物。
3. 3.The two families bartered for thebest seeds.
   两个家庭用最好的种子进行交换。