string(276) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%8E%86%E5%B1%8A%E5%A5%A5%E8%BF%90%E4%BC%9A%E6%89%BF%E5%8A%9E%E5%9B%BD%E5%AE%B6%E6%9C%89%E5%87%A0%E4%B8%AA => Failed to connect to 101.89.143.195 port 38175: Connection refused"
历届奥运会承办国家有几个
