string(268) "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%E9%9E%8B%E5%B0%BA%E7%A0%817.5%E6%98%AF%E4%B8%AD%E5%9B%BD%E7%9A%84%E5%A4%9A%E5%B0%91 => Failed to connect to 14.18.117.71 port 38133: Connection refused"
美国鞋尺码7.5是中国的多少
