string(265) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%85%B3%E9%94%AE%E8%AF%8D%E6%8E%92%E5%90%8D%E4%B8%8D%E9%9D%A0%E5%89%8D%E6%80%8E%E4%B9%88%E5%8A%9E => Failed to connect to 61.171.74.35 port 38027: Connection refused"
关键词排名不靠前怎么办
