Welcome, YantyChen!
As Lynn said, your points about Borneo are very good. We're assembling an interesting mix of languages here.
To clarify on Chinese, He can definitely order food from Beijing, so Mandarin is a definite.
Okay, I'm wondering if there's a difference here in the version of the pilot that's distributed in Australia, as mine shows Clark going to Shanghai rather than Beijing. Anyone able to clarify this?
If he goes to Shanghai, then the Shanghainese dialect is more common than Mandarin.