求翻译：The majority of middle schools in the United States are public schools, and education through high school is obligatory. Therefore, there are no qualifying examinations to enter middle school. Admission to a middle school depends upon the residence of the student. If the student resides within the school district, the student can attend the school. The parents of the student are required to enroll the student into the school. Enrollment can either be done at the school itself or at the school district office, depending on the policy of the school district. Public education in the United States is free, and parents do not pay tuition.是什么意思？

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