Only now do I understand their painstaking effort. In China, the burden on students is very heavy. They go to school during the day and have to go to cram school or work with a private tutor in the evening. They cant even rest on weekends. In China, admission is the baton of teaching, teaching always follows entrance exams.
Teachers emphasize rote memorization.
The homework is even more oppressive so that one cannot even breathe. But students respect teachers and follow the way. Even if they have objections they do not dare to raise them. In the US, generally speaking, teachers emphasize free development. They emphasize education in the inspirational style and encourage students to think more.