string(285) "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%E6%97%B6%E4%BB%A3%E4%BF%A1%E6%81%AF%E6%94%B6%E9%9B%86%E7%9A%84%E7%89%B9%E7%82%B9%E6%98%AF => Failed to connect to 101.89.166.210 port 38089: Connection refused"
大数据时代信息收集的特点是
