string(309) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%AE%BA%E6%96%87%E6%91%98%E8%A6%81%E5%8F%AF%E4%BB%A5%E4%B8%8E%E6%AD%A3%E6%96%87%E5%86%85%E5%AE%B9%E6%97%A0%E5%85%B3%E5%90%97%E5%AF%B9%E5%90%97 => Failed to connect to 14.18.46.51 port 38206: Connection refused"
论文摘要可以与正文内容无关吗对吗
