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    challenge

    US /ˈtʃæləndʒ/

    UK /'tʃælɪndʒ/

    • Noun (Countable/Uncountable)
    • An activity you wish to try that may be hard to do
    • Act of formally inviting someone to compete
    • Transitive Verb
    • To formally invite someone to compete at something
    • To question the correctness of something
    fuel

    US /ˈfjuəl/

    UK /'fju:əl/

    • Transitive Verb
    • To give power to (a mob, anger, etc.); incite
    • To provide gas or petrol for something
    • Uncountable Noun
    • Material used to produce heat or power when burned
    A2TOEIC
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    system

    US /ˈsɪstəm/

    UK /'sɪstəm/

    • Noun (Countable/Uncountable)
    • Set of organized, planned ideas that work together
    • A set of principles or procedures according to which something is done; an organized scheme or method.
    • Adjective
    • Working in an organized, logical way
    A1TOEIC
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    control

    US /kənˈtrol/

    UK /kən'trəʊl/

    • Noun
    • A device designed to operate a machine
    • Participant in experiment that is left untouched
    • Transitive Verb
    • To direct or influence the behavior of something
    • To have power over; to manage or regulate.
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