string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BB%BF%E6%B0%B4%E6%99%B6%E6%9C%89%E4%BB%80%E4%B9%88%E4%BD%9C%E7%94%A8 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
绿水晶有什么作用
