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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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    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
    research

    US /rɪˈsɚtʃ, ˈriˌsɚtʃ/

    UK /rɪ'sɜ:tʃ/

    • Verb (Transitive/Intransitive)
    • To study in order to discover new ideas and facts
    • To study the market relating to marketing products and services.
    • Noun (Countable/Uncountable)
    • Study done to discover new ideas and facts
    • A particular area or topic of study.
    A2TOEIC
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    consistent

    US /kənˈsɪstənt/

    UK /kənˈsɪstənt/

    • Adjective
    • Agreeing with or being similar to another part
    • In agreement; reliable
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