string(264) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BE%8E%E5%9B%BD%E6%9C%89%E5%87%A0%E4%BD%8D%E6%80%BB%E7%BB%9F%E8%A2%AB%E5%88%BA%E6%9D%80%E8%BF%87 => Failed to connect to 14.18.46.51 port 38044: Connection refused"
美国有几位总统被刺杀过
