string(310) "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%92%8C%E5%85%AC%E5%85%83%E5%90%8E%E7%9A%84%E5%8C%BA%E5%88%AB%E6%98%AF%E4%BB%80%E4%B9%88%E5%91%A2 => Failed to connect to 14.116.215.7 port 38225: Connection refused"
中国公元前和公元后的区别是什么呢
