古人为什么会发明鞭炮?因为他们最怕空气突然安静。
Aug 21, 2019 Aug 21, 2019 https://d2t.bkseeker.com/%e5%8f%a4%e4%ba%ba%e4%b8%ba%e4%bb%80%e4%b9%88%e4%bc%9a%e5%8f%91%e6%98%8e%e9%9e%ad%e7%82%ae%ef%bc%9f%e5%9b%a0%e4%b8%ba%e4%bb%96%e4%bb%ac%e6%9c%80%e6%80%95%e7%a9%ba%e6%b0%94%e7%aa%81%e7%84%b6%e5%ae%89