These are the generated micro-lesson videos (slides merged with the narration voiceover). Play a video, download it, and leave comments below — every comment is saved so the development team and the platform's assistant can act on it. 这里是已生成的微课视频（幻灯片与配音合成）。可以播放、下载，并在下方留言 — 所有留言都会保存，供开发团队和平台助手参考改进。
…
Comments 留言
Comments are anonymous. Please mention the section or the time in the video you are commenting on. 留言是匿名的。请注明您评论的是视频中的哪一节或哪个时间点。