string(237) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BC%A0%E6%89%BF%E8%B7%9F%E7%BB%A7%E6%89%BF%E7%9A%84%E5%8C%BA%E5%88%AB => Failed to connect to 14.18.46.51 port 38044: Connection refused"
传承跟继承的区别
