Add a package to the system. Package will be uncompressed into the installation root and the database will be updated.向系统添加一个包。包将被解压缩到安装目录，且数据库将被更新。
RAW: A file format for digital photographs that is uncompressed and largelyunmodified by the camera's chips, and therefo指一种数码照片的文件格式﹐这种数码照片未经压缩﹐基本上未被相机晶片所修改﹐因此包含所有的颜色和影像细节。