:Axiom 2 looks like common sense to me, unless you wish to propose some mechanism by which non-physical processes may produce a physical result in the Chinese-speaker's behaviour. If we're not positing the brain as some sort of 'antenna' that communicates with an ethereal, non-physical entity that does all the 'understanding' itself and meat-puppets the human to act as if it understands, then we're stuck with the notion that electrical and chemical processes in the brain are enough to explain understanding.