网络硬盘，可以上传或者下载资料，很适合一些资料的备份，同时也很方便。-Network hard disk

21天学会JAVA,学习没有捷径，21一天是噱头。读者还是要认真钻研。努力才是王道-Learn Java within 21 days. Hardwork is the key to success in any condition. Don t believe there is any shortcut to get something such as picking up Java within 21 days