string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%89%99%E7%9F%B3%E4%B8%BA%E4%BB%80%E4%B9%88%E6%98%AF%E7%BB%BF%E8%89%B2 => Failed to connect to 14.116.215.7 port 38230: Connection refused"
牙石为什么是绿色
