string(274) "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%E5%A4%A7%E7%BA%A6%E5%A4%9A%E9%95%BF%E6%97%B6%E9%97%B4%E5%91%A2 => Failed to connect to 14.116.215.7 port 38225: Connection refused"
老虎的寿命大约多长时间呢
