string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%85%AC%E5%85%83%E5%89%8D%E5%90%8E%E7%9A%84%E5%88%92%E5%88%86%E4%BE%9D%E6%8D%AE => Failed to connect to 14.18.117.71 port 38069: Connection refused"
公元前后的划分依据
