string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A4%8D%E5%90%88%E5%90%8E%E7%9A%84%E5%86%B7%E6%B7%A1%E6%9C%9F%E6%98%AF%E5%87%A0%E5%B9%B4 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
复合后的冷淡期是几年
