停止访问SD卡。 下载并安装ZAR（Zero Assumption Recovery）。 插入SD卡。 打开ZAR上的“图像恢复”工具。 选择你的SD卡。 选择要恢复的文件。 选择恢复图像的存储位置。 复制文件。

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
If the files has been deleted, there's still a chance that the data is still there, but has just been set to be overwritten by new data. By not accessing the SD card, you increase the chances that the data will not be overwritten. Until you're ready to try recovering files, it's best to remove the SD card from any device. The full version of ZAR requires a purchase, but the demo version allows you to recover image files only. Only download ZAR from the developer's website. On the ZAR website, cl