to back something up (phrasal verb), To support something with evidence or facts, Lingua franca (noun), A language used between people who do not share the same mother tongue, globalization (noun), A process where countries become more connected through trade, culture, and technology, black-and-white (adjective), Something very clear, with only two possible sides (right/wrong, yes/no), a grey area (noun phrase), A situation that is not clear and has no simple answer, to take off (phrasal verb), Suddenly become succesful

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