string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%89%AF%E8%AF%8D%E6%98%AF%E4%BF%AE%E9%A5%B0%E4%BB%80%E4%B9%88%E8%AF%8D%E6%80%A7%E7%9A%84 => Failed to connect to 14.18.117.71 port 38069: Connection refused"
副词是修饰什么词性的
