string(285) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%80%89%E6%8B%A9%E6%81%B0%E5%BD%93%E7%9A%84%E5%85%B3%E8%81%94%E8%AF%8D%E5%A1%AB%E5%9C%A8%E6%8B%AC%E5%8F%B7%E9%87%8C => Failed to connect to 101.89.143.195 port 38175: Connection refused"
选择恰当的关联词填在括号里
