string(270) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%9C%A8wps%E4%B8%AD%E5%BC%95%E7%94%A8%E5%8F%82%E8%80%83%E6%96%87%E7%8C%AE%E7%9A%84%E6%A0%BC%E5%BC%8F => Failed to connect to 101.89.143.195 port 38109: Connection refused"
在wps中引用参考文献的格式
