string(240) "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%80%A7%E6%8A%A4%E7%90%86%E7%9A%84%E5%AE%9A%E4%B9%89 => Failed to connect to 101.89.143.195 port 38175: Connection refused"
延续性护理的定义
