string(291) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%8F%82%E8%80%83%E6%96%87%E7%8C%AE%E5%BC%95%E7%94%A8%E4%B9%A6%E7%B1%8D%E7%9A%84%E6%A0%BC%E5%BC%8F%E6%80%8E%E4%B9%88%E5%BC%84 => Failed to connect to 14.18.46.51 port 38044: Connection refused"
参考文献引用书籍的格式怎么弄
