string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BE%8E%E5%9B%BD%E4%B8%BA%E4%BB%80%E4%B9%88%E4%BC%9A%E5%87%BA%E7%8E%B0%E5%85%B3%E9%97%A8%E7%8E%B0%E8%B1%A1 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
美国为什么会出现关门现象
