求翻译：由于历史的原因，中等职业学校包括普通中等职业学校、成人中等专业学校、技工学校和职业高级中学四类学校。普通中等专业学校是建国后在接管并改造旧中国的高级职业学校的基础上建立起来的，结合我国的情况进行一系列改革与调整，逐步发展和完善起来。技工学校也是在建国后学习苏联和技工教育的模式等经验，结合我国实际经过改革和调整后发展起来的。职业高中主要是在调整中等教育结构的基础上发展起来的，大部分由原来的普通高中改造而成，有些是在普通高中中附设的职业高中班。成人中等专业学校1999年以后被纳入到“高中阶段职业教育”的范畴，包括广播电视中等专业学校、职工中等专业学校、农民中等专业学校、函授中等专业学校、教师进修学校等。进入90年代以来，随着招生和毕业生就业制度改革的深入，传统的四类中等职业学校的培养目标逐步趋同，办学形式也日益类似，主要要面向初、高中毕业生、城乡新增劳动者、下岗失业人员、企事业在职人员、农村劳动者及其他社会成员，开展多种层次、多种形式的学校教育和职业培训，承担着为我国经济和社会发展培养数以亿计的生产、服务第一线的高素质劳动者和实用人才的任务。是什么意思？

Due to historical reasons, including general secondary vocational schools in secondary vocational schools, adult specialized secondary schools, technical schools and vocational high school of the four types of schools. General specialized secondary schools are taking over and transforming the old after the founding of the Chinese high vocational schools established on the basis of, combined with the adjustment of China's reform and the situation of, progressive development and improvement. Technical school is also in the study after the founding of the Soviet Union and technician education modes of experience, combined with China's actual which developed after reform and adjustment. Vocational high school is primarily developed on the basis of adjusting the structure of secondary education, most from the original high school reform, which some are in the senior high school attached to vocational high school class. Specialized secondary schools for adults in 1999 was later incorporated into "high school vocational education" category, including radio and TV specialized secondary schools and specialized secondary schools of workers, farmers, specialized secondary school, specialized secondary schools of correspondence courses, teacher training school. Entered 90 generation yilai, as admissions and graduates employment system reform of in-depth, traditional of four class middle vocational school of training target gradually convergence, running forms also increasingly similar, main to oriented early, and high school graduates, and urban and rural released workers, and laid off unemployment personnel, and enterprise serving personnel, and rural workers and the other social members, carried out multiple levels, and multiple forms of school education and career training, bear was for China economic and social development training number to billion meter of production, and service frontline of high quality workers and practical talent of task.