Great post off_off_dim_and_off
I was just wondering whether ATC Comms carried out in Chinese are in Putonghua (Mandarin) or in the local lingo (like Cantonese)?
For example, you cite "12000m - gao du yao liang dong (level 120)" which I believe is Cantonese or other dialect. As far as I know, in Mandarin it should be "gao du yi er ling." If so, not all Chinese pilots will be able to understand it either.