Retell the main idea of the video you've watched just now. Remember: the words and questions in PPT will help you. Besides, you may begin your retelling with the sentence: Yin and Yang theory, a traditional Chinese philosophical concept, is deeply involved in the Chinese food culture. and you may end it with the sentence: Therefore, we should keep a balanced diet in order to keep healthy. In addition, some connective words are recommended: on the one hand, on the other hand; besides; generally; however; for example; take sth as an example; ...etc. Requirement: As before, upload your recorded retelling in group task, and attach the picture involving your discussion here.