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Readme.md

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-# (Jun 2024) English lecture videos!
+# (Jun 2024) English open course!
 
 [![](./Figure_EnglishLectureVideo.png)](https://youtube.com/playlist?list=PLEhdbSEZZbDaFWPX4gehhwB9vJZJ1DNm8&si=D1T4pcyHsMxj6CzB)
 
-**My first English lecture video is online now.** You can click the above figure or the [link here](https://youtube.com/playlist?list=PLEhdbSEZZbDaFWPX4gehhwB9vJZJ1DNm8&si=D1T4pcyHsMxj6CzB) to jump to our YouTube channel. 
+**My English open course is online now.** You can click the above figure or the [link here](https://youtube.com/playlist?list=PLEhdbSEZZbDaFWPX4gehhwB9vJZJ1DNm8&si=D1T4pcyHsMxj6CzB) to jump to our YouTube channel. 
 
-**There will be 50+ lecture videos in total, each of which is about 10~20 min long**. We have been working on these videos for a while. All these videos will be uploaded one by one within the next few months. Please stay tuned!
+**The open course has ~50 short lecture videos and lasts for ~11 hours long in total.** We have been working on these videos for a while. They will be uploaded one by one within the next few months. Please stay tuned!
 
 **The audios of the videos are generated by AI.** The process is as follows. 
-1) First, the audios of my Chinese lecture videos are extracted and then converted to text. My Chinese lecture videos have been **viewed 900,000+ times** over the internet up to June 2024. 
-2) Second, the Chinese text is translated to English. 
-3) Third, the English text is polished and used (together with my voice sample) to generated English audio. 
-4) Fourth, the audios are aligned with the video pictures manually.
+1) First, the audios of my Chinese lecture videos are extracted and then converted to text. 
+3) Second, the Chinese text is translated to English. 
+4) Third, the English text is polished and used (together with my voice sample) to generated English audio. 
+5) Fourth, the audios are aligned with the video pictures manually.
 
-It is a very time-consuming process! But I believe it is worthwhile to do that since I think **the resulting videos are clear and easy to follow**. 
+I decided to translate from my Chinese lecture videos instead of recording English videos from scratch since the latter is very very time consuming! More importantly, my Chinese lecture videos are high-quality and quite popular (they received **900,000+** views over the internet up to June 2024).
+
+Although it is assisted by AI, it is still a very time-consuming process! But I believe it is worthwhile to do that since **the resulting videos are clear and easy to follow**. 
 
 Hope the lecture videos are helpful to you!
 
 
+
 # (Jun 2024) Minor update before printing
 
 This is the fourth version of the book draft. It is supposed to be the final one before the book is officially published. Specifically, when proofreading the book manuscript, I detected some very minor issues. Together with some reported by enthusiastic readers, they have been revised in this version.