string(319) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BB%B4%E6%9E%9C%E8%8C%A8%E5%9F%BA%E6%89%80%E8%B0%93%E7%9A%84%E6%9C%80%E8%BF%91%E5%8F%91%E5%B1%95%E5%8C%BA%E4%BA%8B%E5%AE%9E%E4%B8%8A%E6%98%AF%E6%8C%87 => Failed to connect to 14.18.117.71 port 38133: Connection refused"
维果茨基所谓的最近发展区事实上是指
