string(276) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A4%A7%E6%95%B0%E6%8D%AE%E5%8F%AF%E8%A7%86%E5%8C%96%E7%9A%84%E7%89%B9%E5%BE%81%E6%9C%89%E5%93%AA%E4%BA%9B => Failed to connect to 101.89.117.144 port 38005: Connection refused"
大数据可视化的特征有哪些
