string(238) "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%E6%98%AF%E5%A4%9A%E5%B0%91 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
老虎的寿命是多少
