The law only says teachers must come from a native English-speaking country, the big 5: Canada, UK, USA, South Africa and Australia. Twenty yuan says this requirement isn’t from Chinese people, it’s for some school for children of racist diplomats. Beijing is just the worst.
Those terms are not exclusive to English. They may not exist in Chinese but I can open my anatomy textbook and find one of those 4 terms right now if I want to.