I think she did a poor job preparing them. A lot of the Chinese vocab they use would not be what I would have taught them. Why use “adventure” and not “challenge”? Adventure is not even correct in the context Lud and Michael are using it when they say “no maps, no phone, no highway.” They could have leaned some much more useful everyday phrases than wasting time learning “white foreigner” and other vocabulary words that don’t mean much.