slang - very informal words and expressions used by a group of people, pick up - to learn by listening and practising, rich vocabulary - a large number of different words and expressions, alien - strange and very different, challenging - difficult but interesting, get by - to succeed at least at a minimum level , fluency - the ability to speak a language easily and well, master - to learn something very well,

New Horizons - B1+ - Conversation - Lesson 22 - Practice 1

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