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    essential

    US /ɪˈsɛnʃəl/

    UK /ɪ'senʃl/

    • Adjective
    • Extremely or most important and necessary
    • Fundamental; basic.
    • Noun
    • A concentrated hydrophobic liquid containing volatile aroma compounds from plants.
    B1TOEIC
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    social

    US /ˈsoʃəl/

    UK /ˈsəuʃəl/

    • Adjective
    • Involving activity with people, e.g. in free time
    • Living together and depending on each other
    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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    maintain

    US /menˈten/

    UK /meɪn'teɪn/

    • Transitive Verb
    • To keep saying something a certain way
    • To keep (machine) working by checking, repairing
    A2TOEIC
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