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juice
n. the liquid part that can be squeezed out of vegetables and fruits
contributor
n. someone or something that contributes something or that contributes to something
factor
n. something that helps produce or influence a result: one of the things that cause something to happen
adolescent
n. a young person who is developing into an adult : a young person who is going through adolescence
tripled
v. to cause (something) to become three times as great or as many
challenge
n. a difficult task or problem: something that is hard to do
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ax
n. a tool that has a heavy metal blade and a long handle and that is used for chopping wood
mainstream
adj. related to the thoughts, beliefs, and choices that are accepted by the largest number of people
society
n. the people of a particular country, area, time, etc., thought of especially as an organized community
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http://www.bbc.co.uk/learningenglish/english/course/english-you-need/unit-17/session-1
