Barbara, when you ask "Are you saying we should all stick to our own languages and create new expressions in them to cover the missing concepts?" - my answer is not that we should stick to our own languages, but that it enriches a language to add new terms in a different - not better, not worse, just different - way than borrowing existing ones from other tongues. I actually agree with either - I like the international flavor of borrowings across languages, but I'm also impressed when new terms can be created from within a language. Take the Zuni, for instance, who got big-time into photography and then coined terms for EVERYTHING - lenses, exposures, any term you can think of, without borrowing any of it from English. Too cool.