string(285) "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%86%E7%95%8C%E7%82%B9%E6%98%AF%E5%93%AA%E5%B9%B4 => Failed to connect to 101.89.117.144 port 38076: Connection refused"
中国公元前后的分界点是哪年
