他不明白人们是怎么用纸来买食物和贵重物品的！他还对人们用来燃烧产生热量的黑色石头感到困惑。
He could not understand how people paid for food and valuable things with paper! He was also puzzled by the black stones people used to burn to produce heat.
他无法理解人们是如何用纸来购买食物和贵重物品的！
He could not understand how people paid for food and valuable things with paper!
他无法理解人们是如何用纸来购买食物和贵重物品的！
He could not understand how people paid for food and valuable things with paper!
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