string(346) "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%E5%BC%95%E7%94%A8%E6%A0%87%E7%82%B9%E7%AC%A6%E5%8F%B7%E7%94%A8%E6%96%B0%E7%BD%97%E9%A9%AC%E6%97%B6%E5%BC%95%E7%94%A8%E5%9C%A8%E9%87%8C%E8%BF%98%E6%98%AF%E5%A4%96 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
论文引用标点符号用新罗马时引用在里还是外
