这一政策体系，经过民族教育政策长期变迁的实践证明是科学、正确和有效的；

The educational practice has proved that the policy system is scientific, correct and effective.

youdao

这一政策体系，经过民族教育政策长期变迁的实践证明是科学、正确和有效的；

The educational practice has proved that the policy system is scientific, correct and effective.

youdao