求翻译：　　中等教育 为12─17岁的少年提供的教育。一般都是由地方政府和业务部门兴办。中等教育机构为普通中学、职业中学和各类中等专业学校。普通中学通常分为初中和高中，学习年限各为3年。初中毕业生一部分升入高中学习，还有一部分升入职业高中和中等专科学校学习，学制为3─5年。是什么意思？

Secondary education, education for the 12 ─ 17-year-old boy. Are generally set up by the local government and business sectors. Secondary education institutions of general secondary schools, vocational schools and specialized secondary schools. General secondary schools often divided into junior and