I am very touched. Thank the tutor for his patience, care and seriousness behind the word-for-word revision. I consider every word, and even correct the spelling habits of a word and a punctuation mark, which makes me realize my academic attitude. Very rewarding. We are all engaged in education, and the methods and examples explained by teachers have benefited me a lot. It's really "not angry and threatening, not angry and mourning, not angry and threatening", which has never been deeply understood in undergraduate education and even in microteaching. I am also ashamed that I am not serious enough and academic enough, and ashamed of my own shortcomings.