string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=3d%E7%94%B5%E5%BD%B1%E6%8A%80%E6%9C%AF%E5%8F%91%E5%B1%95%E7%8E%B0%E7%8A%B6 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
3d电影技术发展现状
