Peter,
For climbers who cames form other country,English is not so easy to understanding.
Since I learn tree climbing,I never translate all the shout commend into Chinese language in Taiwan.because the international tree climbers should be have everyone understanding all the tree climbing vocabulary/language what he is shouted.
At the same reason,I will recommend the tree climbing vocabulary are not too complicate to understanding.
When I was in Atlanta,the vocabulary people speaking are with many slang that I never understand.and I can't check the slang in the dictionary.
So,the slang for me is just like a language from Mars.

Please make the tree climbing vocabulary easy to recognize and easy understand.
Appreciate.

Elliot / Tree Climbing Taiwan