string(283) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%A2%AB%E5%87%8F%E6%95%B0%E4%B8%8E%E5%87%8F%E6%95%B0%E7%9A%84%E5%8C%BA%E5%88%AB%E6%98%AF%E4%BB%80%E4%B9%88%E5%91%80 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
被减数与减数的区别是什么呀
