柔声地说 发表于 2025-4-1 02:58:16
Michael Sonntag vocational teaching is not really possible at the moment, since the contextual information is missing. The more substantial volumes on the topic on the international level date back 30 years or more (see also Tables 13.1 and 13.2 in the Appendix, Int- national Labour Organisation, 1964; UNESCO, 197