string(276) "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%87%A0%E4%B8%AA%E6%80%BB%E7%BB%9F%E8%A2%AB%E5%88%BA%E6%9D%80 => Failed to connect to 101.89.117.144 port 38076: Connection refused"
美国一共有几个总统被刺杀
