string(258) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%9C%89%E4%BB%80%E4%B9%88%E6%9C%89%E8%B6%A3%E7%9A%84%E7%89%A9%E7%90%86%E7%8E%B0%E8%B1%A1 => Failed to connect to 101.89.117.144 port 38208: Connection refused"
有什么有趣的物理现象
