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    theory

    US /ˈθiəri, ˈθɪri/

    UK /ˈθiəri/

    • Noun (Countable/Uncountable)
    • Ideas or principles that explain facts or events
    • An idea or belief about something
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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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    explain

    US /ɪkˈsplen/

    UK /ɪk'spleɪn/

    • Transitive Verb
    • To make clear or easy to understand by describing
    • To give a reason for something.
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    science

    US /ˈsaɪəns/

    UK /'saɪəns/

    • Uncountable Noun
    • Study of the physical world, based on facts
    A2TOEIC
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    energy point vocabulary