Dongdong found that the teacher was wrong. Why did he bring this up? The word "in the making"

Because Dongdong respects his teacher very much, Dongdong's teacher speaks very well in class. Like high school students, he can mingle with his classmates. Dongdong loves learning. He admires the teacher very much. He thinks the teacher is very competent and has a perfect image. He felt sorry for the teacher's misreading and felt it necessary to bring it up. As for the impact on the teacher, the students will not complain about him, which was not considered at that time. This is actually a heartfelt respect for the teacher, but it is a bit rash. Maybe it's better to bring it up with the teacher alone after class.