string(244) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=ad%E5%92%8Cd3%E6%9C%89%E5%BF%85%E8%A6%81%E4%BA%A4%E6%9B%BF%E5%90%83%E5%90%97 => Failed to connect to 101.89.159.206 port 38075: Connection refused"
ad和d3有必要交替吃吗
