string(301) "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%E9%83%A8%E5%88%86%E6%80%8E%E4%B9%88%E6%A0%87%E6%B3%A8%E6%89%8D%E4%B8%8D%E7%AE%97%E6%8A%84%E8%A2%AD => Failed to connect to 14.18.117.71 port 38164: Connection refused"
论文引用部分怎么标注才不算抄袭
