string(237) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B1%9F%E6%81%A9%E7%90%86%E8%AE%BA%E7%9A%84%E5%B1%80%E9%99%90%E6%80%A7 => Failed to connect to 14.18.46.51 port 38044: Connection refused"
江恩理论的局限性
