string(294) "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%E4%B8%80%E5%85%B1%E6%9C%89%E5%A4%9A%E5%B0%91%E4%BB%BB%E6%80%BB%E7%BB%9F%E8%A2%AB%E5%88%BA%E6%9D%80%E8%BF%87 => Failed to connect to 101.89.159.206 port 38187: Connection refused"
美国一共有多少任总统被刺杀过
