Why don't Fangchenggang people speak Mandarin?

The main reason why Fangchenggang people don't speak Mandarin is that they are not used to speaking Mandarin and don't realize how important it is. Friends all like the natural environment of Fangchenggang's investment, but every time they come back from the inspection, they will be dismissed on the grounds of "great differences in human environment". Finally, my conclusion is that it is more worthwhile for residents of the global village to learn English than to learn the local language! New walker