string(258) "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%A0%87%E5%BC%95%E7%94%A8%E6%A0%BC%E5%BC%8F%E4%BC%9A%E4%B9%B1%E5%90%97 => Failed to connect to 101.89.159.206 port 38075: Connection refused"
论文标引用格式会乱吗
