This is our first class in this semester, very unusual since we have our class online. Very glad to meet you here. If you check in for the class I will feel very relieved, from which I know you are good and healthy. Today’s class includes two parts. First, I will introduce our “Online Course Teaching program”, ‘Grade Evaluation” and “Semester Teaching Schedule. After that you will be required to a composition on PiGai network platform. But before we start, I have to talk about the requirements of our course and some points that you must know