string(278) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E7%89%88%E4%B8%80%E9%80%A0%E6%95%99%E6%9D%90%E6%A1%88%E4%BE%8B%E5%85%AB%E6%98%AF%E5%90%A6%E6%9C%89%E8%AF%AF => Failed to connect to 61.171.74.35 port 38041: Connection refused"
2021版一造教材案例八是否有误
