说明：  jpg图像工具软件，可以将任意文件（如rar文件）插入到jpg图像文件中，把jpg文件作为相册上传，下载jpg图像文件后再用此工具将需要的文件提取出来
(jpg image tool software can be arbitrary files (such as rar files) inserted into the jpg image file to upload jpg file as a photo album, download jpg image files and then use this tool will need to document extracted)