I cannot provide a transcript in Arabic. You stated that the transcript is not available for this video. To get a transcript, you would need to either obtain it from the video's creator or use a transcription service that can process the audio or video file. I can only work with the information you provide.
The video is an introductory lecture on Arabic linguistics as part of a series on the introductions to various sciences. Since the transcript is unavailable, a detailed introduction cannot be provided.