求翻译：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,是什么意思？

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