string(273) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%85%B3%E8%81%94%E8%AF%8D%E8%83%BD%E4%B8%8D%E8%83%BD%E5%87%BA%E7%8E%B0%E4%B8%A4%E6%AC%A1%E4%B8%BB%E8%AF%AD => Failed to connect to 14.18.46.51 port 38206: Connection refused"
关联词能不能出现两次主语
