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I see. Thanks.

It wouldn't be clear out-of-context in English, but I could also say "somebody who only needs to speak a language for a short time". Somebody who isn't going to study it thoroughly and learn to speak...

Yeah, definitely a phrasebook.

"Разговорник"? Doesn't that mean something like "a one-off speaker"? Love it.

"форточка" seems to be a small window. Меншое окно.