string(239) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%A4%E4%B8%AAc%E7%89%8C%E5%AD%90%E6%98%AF%E5%95%A5%E6%A0%87%E5%BF%97 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
两个c牌子是啥标志
