slang - very informal language that is usually spoken rather than written, used especially by particular groups of people, to master - to learn how to do something well, to pick up - to learn a new skill or language by practising it rather than being taught it, vocabulary - all the words known and used by a particular person, fluency - the ability to speak or write a language easily, well, and quickly, challenging - difficult, in a way that tests your ability or determination, alien - strange and not familiar, complicated - involving a lot of different parts, in a way that is difficult to understand,

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