string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%80%81%E8%99%8E%E7%9A%84%E5%AF%BF%E5%91%BD%E4%B8%80%E8%88%AC%E4%B8%BA%E5%A4%9A%E5%A4%A7 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
老虎的寿命一般为多大
