string(273) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%BA%E4%BB%80%E4%B9%88%E7%BE%8E%E5%9B%BD%E7%9A%84%E9%A3%9E%E6%9C%BA%E9%82%A3%E4%B9%88%E5%85%88%E8%BF%9B => Failed to connect to 14.18.46.51 port 38044: Connection refused"
为什么美国的飞机那么先进
