string(292) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%AD%E5%9B%BD%E5%85%AC%E5%85%83%E5%89%8D%E5%90%8E%E7%9A%84%E5%88%92%E5%88%86%E6%98%AF%E5%93%AA%E4%B8%AA%E6%9C%9D%E4%BB%A3 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
中国公元前后的划分是哪个朝代
