He was also puzzled by the black stones people used toburnto produce heat.
他还对人们用来燃烧产生热量的黑色石头感到困惑。
2
He could not understand how people paid for food and valuable things with paper! He was also puzzled by the black stones people used toburnto produce heat.
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。
3
Our discussion gave me a burnto meet more philosophers. That is how my project started.