string(275) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BB%B6%E7%BB%AD%E6%8A%A4%E7%90%86%E7%9A%84%E7%89%B9%E5%BE%81%E4%B8%8D%E5%8C%85%E6%8B%AC%E4%BB%80%E4%B9%88 => Failed to connect to 101.91.112.32 port 38162: Connection refused"
延续护理的特征不包括什么
