string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%9B%9B%E8%89%B2%E8%AE%B0%E5%BF%86%E6%B3%95%E5%81%9A%E7%AC%94%E8%AE%B0 => Failed to connect to 14.116.215.7 port 38225: Connection refused"
四色记忆法做笔记
