string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%8A%95%E5%BD%B1%E4%BB%AA%E7%94%A8%E7%99%BD%E5%A2%99%E5%A5%BD%E8%BF%98%E6%98%AF%E5%B9%95%E5%B8%83%E5%A5%BD => Failed to connect to 14.18.117.71 port 38093: Connection refused"
投影仪用白墙好还是幕布好
