string(265) "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%E5%8E%86%E4%BB%A3%E6%80%BB%E7%BB%9F%E8%A2%AB%E5%88%BA%E6%9D%80%E4%BA%86%E5%90%97 => Failed to connect to 14.18.117.71 port 38069: Connection refused"
美国历代总统被刺杀了吗
