大侠帮我翻译一句英文杜绝机器翻译

Is the education system in US universities very flexible? Can undergrads graduate by completing the required credits or do they have to complete a four-year manadatory period like in China? Is it usual for Americans to take frequent breaks over ten over years to complete their graduate degrees? What kind of undergrad is considered elite in the US? Is it like in China where undergrads with the highest score are deemed smartest? In the US, are there less than 30 students per class for elementary schools to high schools?

American University of the system is not very flexible? Provided for as long as the end credits to graduate on the same or like China is a four-year university? Read off people in the United States for several decades by the time it is common for a degree? In the United States what kind of students were considered to be good? Is not achieved, as well as students in China are considered to be intelligent, good? Schools in the United States, from primary school to