你是一个大学教师，正在给学生上课，固定镜头，正面面对镜头，画面中只有教师，目光始终平视前方，不出现其他内容以及字幕。讲课时，站在原地，不能走动，面目表情一定是端庄严肃的，整体都是很平稳，表达内容时候，双手轻微的摆动，很自然，让人感觉你就是一个严肃的老师。口播内容：Let’s dive deeper into that today. Open your notebooks, and let’s get started!.---The provided image does not contain any content related to questions, options, mathematical formulas, chemical equations, or tables. It is not a chart or a diagram. The image depicts a portrait of a young woman from the chest up, against a plain black background. **Image Description:** * **Subject:** A young woman. * **Appearance:** She has long, dark brown hair with bangs, fair skin, and dark eyes. She is smiling subtly with her lips closed. * **Attire:** She is wearing a light blue collared shirt with buttons, underneath a dark blue V-neck vest. * **Orientation:** Her face is directed towards the viewer, and her posture is upright.