string(322) "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%E7%A9%BA%2C%E9%80%89%E6%8B%A9%E9%A2%98%E6%80%8E%E4%B9%88%E5%81%9A%E7%9A%84 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
选择恰当的关联词填空,选择题怎么做的
