What are the opening and closing remarks of the lecture?

Parents and children: Hello! ?

Welcome to our free open class of horse English today. First of all, on behalf of all the staff of XX School, please allow me to thank all the guests who came to attend and listen to our lecture today. Thank you for coming.

First, let me introduce myself. My name is XXX, and I am the host of this open class, from XX school. At the same time, in order to ensure that our activities can be carried out smoothly and that our parents and children are happy with your arrival.

Second, the conclusion.

Today, our teaching and research activities have come to an end, and you must have gained a lot, which will certainly help your future education and teaching work. Finally, I want to say: Thank you, Mr. Zhang Xiaoying, for your wonderful class, and thank you for your wonderful speech.

Precautions:

Whether the expression of "the position and function of teaching materials" is appropriate directly reflects the understanding of teaching materials by the lecturers and affects the formulation of teaching objectives. The deeper you understand the textbook, the more substantial and comprehensive the lecture content will be. On the contrary, you can only touch the surface. Look at an example:

The research on the transformation of sulfur elements with different valence states in the laboratory is the content of the second class in Chapter 3 of Chemistry 1 (Compulsory) (Luko Edition). The content of this section is introduced in the textbook after introducing "carbon diversity" and "nitrogen cycle". Therefore, students have a certain foundation in the methods and steps of studying material properties, and can carry out simple experimental inquiry activities.