Even a campfire can be improved 🔥 连篝火都可以改善
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📍 Bulgaria
There is something very smart about the pipes over the fire. The hot air gets filled up in the pipe pushing up to be released. This will suck in more air from below, feeding the flame. The smoke also gets released high above so everyone don't have to breath it.📍 保加利亚
火上的管道有些聪明的技术。 管道中充满了热空气，向上推动以将其释放。 这将从下方吸入更多的空气，从而提供火焰。 烟雾也被释放到高处，因此每个人都不必呼吸。
Even 
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Posted from Steem中文社区 : http://cnstm.org/blog/2019/10/07/even-a-campfire-can-be-improved-%e8%bf%9e%e7%af%9d%e7%81%ab%e9%83%bd%e5%8f%af%e4%bb%a5%e6%94%b9%e5%96%84/
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